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[Search a list of Patent Appplications for class 246]  Class   246RAILWAY SWITCHES AND SIGNALS
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   [List of Patents for class 246 subclass 1R]  1R           MISCELLANEOUS
    [List of Patents for class 246 subclass 1C]  1C           Subclass 1C indent level is 1 Signals and indicators
   [List of Patents for class 246 subclass 2R]  2R           TRAIN DISPATCHING
   [List of Patents for class 246 subclass 3]  3           Subclass 3 indent level is 1 Central signal control
    [List of Patents for class 246 subclass 4]  4           Subclass 4 indent level is 2 Cab signal or train control
    [List of Patents for class 246 subclass 5]  5           Subclass 5 indent level is 2 Selective
    [List of Patents for class 246 subclass 6]  6           Subclass 6 indent level is 1 Train-order cab signal or train control
   [List of Patents for class 246 subclass 7]  7           Subclass 7 indent level is 1 Train telegraphy or telephony
    [List of Patents for class 246 subclass 8]  8           Subclass 8 indent level is 2 Inductive
   [List of Patents for class 246 subclass 9]  9           Subclass 9 indent level is 2 Continuous contacts
   [List of Patents for class 246 subclass 10]  10           Subclass 10 indent level is 3 Traction rail return
    [List of Patents for class 246 subclass 11]  11           Subclass 11 indent level is 4 Multiple contact
    [List of Patents for class 246 subclass 12]  12           Subclass 12 indent level is 3 Instruments in series
    [List of Patents for class 246 subclass 13]  13           Subclass 13 indent level is 2 Emergency signal stations
   [List of Patents for class 246 subclass 14]  14           Subclass 14 indent level is 1 Station, block, or train-order signals
   [List of Patents for class 246 subclass 15]  15           Subclass 15 indent level is 2 Safety systems
    [List of Patents for class 246 subclass 16]  16           Subclass 16 indent level is 3 Holders
    [List of Patents for class 246 subclass 17]  17           Subclass 17 indent level is 2 Rotary, vertical axis
    [List of Patents for class 246 subclass 18]  18           Subclass 18 indent level is 2 Double semaphore
    [List of Patents for class 246 subclass 2E]  2E           Subclass 2E indent level is 1 Orientation
    [List of Patents for class 246 subclass 2F]  2F           Subclass 2F indent level is 1 Frequency
    [List of Patents for class 246 subclass 2S]  2S           Subclass 2S indent level is 1 Spacing
    [List of Patents for class 246 subclass 19]  19           STAFF AND TABLET SYSTEMS
   [List of Patents for class 246 subclass 20]  20           BLOCK-SIGNAL SYSTEMS
   [List of Patents for class 246 subclass 21]  21           Subclass 21 indent level is 1 Semi-automatic
   [List of Patents for class 246 subclass 22]  22           Subclass 22 indent level is 2 Electromanual
    [List of Patents for class 246 subclass 23]  23           Subclass 23 indent level is 3 Cab signal or train control
    [List of Patents for class 246 subclass 24]  24           Subclass 24 indent level is 3 Circuit controllers
   [List of Patents for class 246 subclass 25]  25           Subclass 25 indent level is 3 Lock and block
    [List of Patents for class 246 subclass 26]  26           Subclass 26 indent level is 4 Track-circuit control
   [List of Patents for class 246 subclass 27]  27           Subclass 27 indent level is 1 Automatic
   [List of Patents for class 246 subclass 28R]  28R           Subclass 28R indent level is 2 Electric
   [List of Patents for class 246 subclass 29R]  29R           Subclass 29R indent level is 3 Radiant energy
    [List of Patents for class 246 subclass 30]  30           Subclass 30 indent level is 4 Hertzian wave
    [List of Patents for class 246 subclass 29A]  29A           Subclass 29A indent level is 4 Electronic gaseous ionization devices
   [List of Patents for class 246 subclass 31]  31           Subclass 31 indent level is 3 Propulsion-current control
    [List of Patents for class 246 subclass 32]  32           Subclass 32 indent level is 4 Current consumption
    [List of Patents for class 246 subclass 33]  33           Subclass 33 indent level is 3 Single track
   [List of Patents for class 246 subclass 34R]  34R           Subclass 34R indent level is 3 Varying-current track circuit
   [List of Patents for class 246 subclass 35]  35           Subclass 35 indent level is 4 Propulsion-current return
   [List of Patents for class 246 subclass 36]  36           Subclass 36 indent level is 5 Double rail
    [List of Patents for class 246 subclass 37]  37           Subclass 37 indent level is 6 Impedance bond
    [List of Patents for class 246 subclass 38]  38           Subclass 38 indent level is 4 Wireless distant control
    [List of Patents for class 246 subclass 39]  39           Subclass 39 indent level is 4 Line-wire distant control
    [List of Patents for class 246 subclass 40]  40           Subclass 40 indent level is 4 Single block
    [List of Patents for class 246 subclass 34A]  34A           Subclass 34A indent level is 4 Approach control
    [List of Patents for class 246 subclass 34B]  34B           Subclass 34B indent level is 4 Coded circuits
    [List of Patents for class 246 subclass 34C]  34C           Subclass 34C indent level is 4 Insulation breakdown
    [List of Patents for class 246 subclass 34D]  34D           Subclass 34D indent level is 4 Saturable reactors
    [List of Patents for class 246 subclass 34CT]  34CT           Subclass 34CT indent level is 4 Continuous track
   [List of Patents for class 246 subclass 41]  41           Subclass 41 indent level is 3 Direct current, normally closed, track circuit
   [List of Patents for class 246 subclass 42]  42           Subclass 42 indent level is 4 Propulsion-current return
    [List of Patents for class 246 subclass 43]  43           Subclass 43 indent level is 5 Varying
   [List of Patents for class 246 subclass 44]  44           Subclass 44 indent level is 4 Wireless distant control
    [List of Patents for class 246 subclass 45]  45           Subclass 45 indent level is 5 Current reversal
   [List of Patents for class 246 subclass 46]  46           Subclass 46 indent level is 4 Line-wire distant control
   [List of Patents for class 246 subclass 47]  47           Subclass 47 indent level is 5 Cab signal or train control
    [List of Patents for class 246 subclass 48]  48           Subclass 48 indent level is 6 Bridged insulated rail joint
    [List of Patents for class 246 subclass 49]  49           Subclass 49 indent level is 6 Intermittent contact
    [List of Patents for class 246 subclass 50]  50           Subclass 50 indent level is 5 Current characteristic
    [List of Patents for class 246 subclass 51]  51           Subclass 51 indent level is 5 Overlapped blocks
    [List of Patents for class 246 subclass 52]  52           Subclass 52 indent level is 5 Home and distant
    [List of Patents for class 246 subclass 53]  53           Subclass 53 indent level is 5 Three position
   [List of Patents for class 246 subclass 54]  54           Subclass 54 indent level is 4 Single block
   [List of Patents for class 246 subclass 55]  55           Subclass 55 indent level is 5 Cab signal or train control
    [List of Patents for class 246 subclass 56]  56           Subclass 56 indent level is 6 Intermittent contact
    [List of Patents for class 246 subclass 57]  57           Subclass 57 indent level is 6 Bridged insulated rail joint
   [List of Patents for class 246 subclass 58]  58           Subclass 58 indent level is 3 Direct-current, normally open, track circuit
    [List of Patents for class 246 subclass 59]  59           Subclass 59 indent level is 4 Cab signal or train control
    [List of Patents for class 246 subclass 60]  60           Subclass 60 indent level is 4 Distant-signal control
    [List of Patents for class 246 subclass 61]  61           Subclass 61 indent level is 3 Superimposed propulsion current
   [List of Patents for class 246 subclass 62]  62           Subclass 62 indent level is 3 Cab signal or train control
   [List of Patents for class 246 subclass 63R]  63R           Subclass 63R indent level is 4 Inductive
    [List of Patents for class 246 subclass 63C]  63C           Subclass 63C indent level is 5 Continuous
    [List of Patents for class 246 subclass 63A]  63A           Subclass 63A indent level is 5 Intermittent
   [List of Patents for class 246 subclass 64]  64           Subclass 64 indent level is 4 Train-carried current supply
   [List of Patents for class 246 subclass 65]  65           Subclass 65 indent level is 5 Multiple continuous contacts
    [List of Patents for class 246 subclass 66]  66           Subclass 66 indent level is 6 Sectional
   [List of Patents for class 246 subclass 67]  67           Subclass 67 indent level is 5 Single continuous contact
    [List of Patents for class 246 subclass 68]  68           Subclass 68 indent level is 6 Sectional
   [List of Patents for class 246 subclass 69]  69           Subclass 69 indent level is 5 Intermittent contact
    [List of Patents for class 246 subclass 70]  70           Subclass 70 indent level is 6 Rail circuit
    [List of Patents for class 246 subclass 71]  71           Subclass 71 indent level is 6 Rail return
    [List of Patents for class 246 subclass 72]  72           Subclass 72 indent level is 4 Propulsion-current signaling
    [List of Patents for class 246 subclass 73]  73           Subclass 73 indent level is 4 Continuous contact
    [List of Patents for class 246 subclass 74]  74           Subclass 74 indent level is 4 Intermittent contact
    [List of Patents for class 246 subclass 75]  75           Subclass 75 indent level is 4 Bridged insulated rail joint
    [List of Patents for class 246 subclass 76]  76           Subclass 76 indent level is 4 Track trip
   [List of Patents for class 246 subclass 77]  77           Subclass 77 indent level is 3 Counting in and out
   [List of Patents for class 246 subclass 78]  78           Subclass 78 indent level is 4 Ratchet wheel
   [List of Patents for class 246 subclass 79]  79           Subclass 79 indent level is 5 Double opposed pawls
    [List of Patents for class 246 subclass 80]  80           Subclass 80 indent level is 6 Parallel teeth
   [List of Patents for class 246 subclass 81]  81           Subclass 81 indent level is 3 Propulsion-current signaling
    [List of Patents for class 246 subclass 82]  82           Subclass 82 indent level is 4 Rotary controller
   [List of Patents for class 246 subclass 83]  83           Subclass 83 indent level is 4 Car-actuated controller
    [List of Patents for class 246 subclass 84]  84           Subclass 84 indent level is 5 Trolley or plow
    [List of Patents for class 246 subclass 85]  85           Subclass 85 indent level is 4 Intermittent contact
    [List of Patents for class 246 subclass 86]  86           Subclass 86 indent level is 3 Train-carried current supply
   [List of Patents for class 246 subclass 87]  87           Subclass 87 indent level is 3 Line-current supply
    [List of Patents for class 246 subclass 88]  88           Subclass 88 indent level is 4 Intermediate signal
    [List of Patents for class 246 subclass 89]  89           Subclass 89 indent level is 4 Short sectional rail closure
   [List of Patents for class 246 subclass 90]  90           Subclass 90 indent level is 4 Car-actuated controller
    [List of Patents for class 246 subclass 91]  91           Subclass 91 indent level is 5 Relay
    [List of Patents for class 246 subclass 92]  92           Subclass 92 indent level is 4 Intermittent contact
    [List of Patents for class 246 subclass 28C]  28C           Subclass 28C indent level is 3 Ballast leakage
    [List of Patents for class 246 subclass 28E]  28E           Subclass 28E indent level is 3 Economy use of line wire
    [List of Patents for class 246 subclass 28F]  28F           Subclass 28F indent level is 3 Checking circuits
    [List of Patents for class 246 subclass 28G]  28G           Subclass 28G indent level is 3 Light-out
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