Utility
Subclass Subgroup Patent
E05D 1/04 09810009
F21S 48/211 09810393
F24F 11/006 09810443
G01C 21/34 09810541
G01S 7/52004 09810778
G06F 3/044 09811220
    09811228
  8/433 09811322
H01H 37/52 09812275
  71/522 09812276
H04L 63/1441 09813442
H04W 4/027 09813873