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Adjustable motor-driven invalid chair with endless tracks
US 3,068,950 A
Filed
: 10/10/1961
Issued
: 12/18/1962
Est. Priority Date
: 10/10/1961
Status: Expired due to Term
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Current Assignee
Isaac F. Davidson
Original Assignee
Isaac F. Davidson
Inventors
Davidson, Isaac F.
Application Number
US04/144,233
Time in Patent Office
434 Days
Field of Search
US Class Current
180/9.23
CPC Class Codes
A61G 5/061
for climbing stairs
A61G 5/066
with endless belts
A61G 5/107
positioning the whole seat ...
B62B 2301/256
by using endless belts
B62B 9/02
providing for travelling up...
B62D 55/075
Tracked vehicles for ascend...
Y10S 180/907
Motorized wheelchairs
Y10S 280/10
Stair climbing chairs
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