- 171 - 
PATENT INDEX 
British patents 
394,977 (394) 
437,171 (34) 
445,576 (139) 
Canadian patents 
369,499 (214) 
French patents 
794,206 (35) 
797,052 (213) 
CTerraan patents 
630,483 (125) 
643,804 (80) 
2,024,392 
2,030,564 
2,042,296 
2,052,374 
2,056 . -,33 
a, 058, 200 
2,056,832 
2,066.134 
2,087 3 o99 
2,089,765 
2,090,109 
2,096,885 
2,103,195 
2,104,757 
U, S. patents 
(363) 
(184) 
(56) 
(476) 
(456) 
(477) 
(365) 
(282) 
(208) 
(373) 
(85) 
(117) 
(222) 
(311) 
