Railways: surface track – Electrical connections – Combined rail joint or support
Patent
1980-03-03
1981-10-13
Powell, William A.
Railways: surface track
Electrical connections
Combined rail joint or support
5417, 206216, 229 56, 405 19, 428 76, E01B 2300
Patent
active
042944058
ABSTRACT:
A traction device for use with automobiles which comprises a wedge shaped bag filled with sand or a sand like material which when placed under the wheels of a car provides increased traction so that the car can be moved from a slippery place.
REFERENCES:
patent: 2438563 (1948-03-01), Kollmeyer
patent: 3561219 (1971-02-01), Nishizawa
patent: 3874177 (1975-04-01), De Winter
Bokan Thomas E.
Powell William A.
Ulrich Richard P.
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