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Air
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A self-propelling air hoist, with unlimited travel
An automatic recorder of emergency brake applications
Report on the new hardie air-motor cars now in use on the 28th and 29th Street Line, New York City
Compressed air for street railway operation
Compressed-air traction in New York City
Traction by compressed air at Paris
Proper method of cleaning brake cylinders and triple valves of freight cars
A high duty air compressor driven by the largest pelton wheel in the world
The maintenance of air brakes on freight cars
An automatic pressure retainer for driver brakes