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Mechanical movements, powers and devices (1907)
Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 365
^-^ [kjj ^^j 1469. PORTABLE STEAM DERRICK, on swivelled platform, balanced by boiler. … 1470. SWING-BOOM CRANE, with atravelling truck and trolley lift. Boom re-volving on radial rollers.Mechanical movements
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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