Class   138	PIPES AND TUBULAR CONDUITS
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26

WITH PRESSURE COMPENSATORS

27

. (1 indent ) Freeze protecting

28

.. (2 indent ) Expansible or compressible tube element

30

. (1 indent ) Variable capacity chambers

31

.. (2 indent ) Piston or plunger type

32

THAWING AND FREEZE PROTECTION

33

. (1 indent ) Electric

34

. (1 indent ) Anti-freeze substance

35

. (1 indent ) Portable thawing apparatus

36

WITH WEAR INDICATOR

37

WITH FLOW REGULATORS AND/OR BAFFLES

38

. (1 indent ) Heat transfer

39

. (1 indent ) Flow facilitating

40

. (1 indent ) Restrictors

41

.. (2 indent ) With screen

42

.. (2 indent ) Tortuous path

43

... (3 indent ) Variable restriction

44

.. (2 indent ) Central path

45

... (3 indent ) Variable restriction

46

.. (2 indent ) Variable restriction

89

WITH CLOSURES AND PLUGS

. (1 indent ) Inflation stem type

89.1

.. (2 indent ) Air and dust cap

89.2

... (3 indent ) Combined

89.3

.. (2 indent ) Air cap

89.4

.. (2 indent ) Dust cap

90

. (1 indent ) Test plugs

91

. (1 indent ) Double end

92

. (1 indent ) Lateral opening

93

. (1 indent ) Inflatable

94

. (1 indent ) Laterally insertable

94.3

.. (2 indent ) Line blinds

94.5

... (3 indent ) Pivoted

95

. (1 indent ) Return bend type

96R

END PROTECTORS

96T

. (1 indent ) Threaded

97

REPAIRING

98

. (1 indent ) Patches

99

.. (2 indent ) External

100

BREAKJOINT

101

. (1 indent ) Distinct layers

102

. (1 indent ) With base

103

COMBINED

104

. (1 indent ) With indicating means

105

. (1 indent ) With trench

106

. (1 indent ) With external support structure

107

.. (2 indent ) Suspended

108

. (1 indent ) With means to support disparate element therein

109

. (1 indent ) With end structure

110

. (1 indent ) With hose protector

111

PLURAL DUCT

112

. (1 indent ) With spacer and encircling element

113

. (1 indent ) Surrounding radially spaced duct with axially spaced supports for internal duct

114

. (1 indent ) Coaxial

115

. (1 indent ) Longitudinally extending common wall

116

.. (2 indent ) Distinct

117

.. (2 indent ) Complementary sections

118

FLEXIBLE

118.1

. (1 indent ) Casing

119

. (1 indent ) With means for facilitating collapse

120

. (1 indent ) Joined sections

121

. (1 indent ) Corrugated

122

.. (2 indent ) Spirally

123

. (1 indent ) Braided, interlaced, knitted or woven

124

.. (2 indent ) Distinct layers

125

... (3 indent ) Plastic

126

.... (4 indent ) Rubber

127

....• (5 indent ) With metal

128

. (1 indent ) Longitudinally seamed

129

. (1 indent ) Spirally wound material

130

.. (2 indent ) Oppositely wound

131

.. (2 indent ) Metal core

132

.. (2 indent ) Embedded

133

... (3 indent ) Metal

134

.. (2 indent ) Metal

135

... (3 indent ) With interlocked or clamped edge

136

.... (4 indent ) Packed or sealed

137

. (1 indent ) Distinct layers

138

.. (2 indent ) With intermediate metal element

139

.. (2 indent ) Metal liner

140

DISTINCT LAYERS

141

. (1 indent ) Bonded to each other

142

.. (2 indent ) Brazed, soldered or welded

143

.. (2 indent ) Metal

144

.. (2 indent ) Spirally wound layer

145

. (1 indent ) Coated

146

.. (2 indent ) Diverse coating material

147

. (1 indent ) With mechanical means to hold layers in contact

148

. (1 indent ) Spaced

149

. (1 indent ) With intermediate insulation layer

150

. (1 indent ) With spiral seam

151

. (1 indent ) With longitudinal seam

152

.. (2 indent ) Material of one layer passing through seam

153

. (1 indent ) Reinforced

154

SPIRALLY SEAMED

155

JOINED SECTIONS

156

LONGITUDINALLY SEAMED

157

. (1 indent ) Sectional

158

.. (2 indent ) With separate mechanical securing means

159

... (3 indent ) Bolt, nail, rivet or screw

160

.... (4 indent ) Radially extending

161

... (3 indent ) Externally encircling

162

.. (2 indent ) Tongue and slot

163

.. (2 indent ) Bent over lip or flange

164

. (1 indent ) With packing

165

. (1 indent ) With wedge

166

. (1 indent ) With tongue in slot

167

. (1 indent ) With diverse locking means

168

. (1 indent ) With interlocking hooks

169

. (1 indent ) Diversity of seam

170

. (1 indent ) Permanent type seam

171

.. (2 indent ) Brazed, soldered or welded

172

REINFORCED

173

. (1 indent ) Corrugated

174

. (1 indent ) With embedded element

175

.. (2 indent ) Clay, concrete or masonry

176

... (3 indent ) Reinforcement under tension

177

STRUCTURE

178

MISCELLANEOUS

	FOREIGN ART COLLECTIONS

FOR000

CLASS-RELATED FOREIGN DOCUMENTS

	DIGESTS

DIG1

ADHESIVE

DIG2

GLASS FIBER

DIG3

TEFLON™, KEL-F

DIG4

AIR CONDITIONING

DIG5

PRE-STRESS

DIG6

CORROSION

DIG7

RESINS

DIG8

BENT SHAPED RETAINED

DIG9

CELLULAR

DIG10

METAL FOIL

DIG11

SHAPE

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