1939 Suppliers to the Aircraft Industry - Graces Guide
These range from the portable 2 h.p. set up to the large workshop set for pneumatic tools, etc., which provides air at 120 lb. continuously. An intermediate set for testing hydraulic landing gear, etc. is driven by a 5 h.p. motor and provides air up to 3,000 lb. per sq. in. by a three-stage Lacy-Hulbert compressor.
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