Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 390
1568. SWING DERRICK, with fixed boomSteam hoist. MISCELLANEOUS DEVICES. 379 … 1569. PACKAGE ELEVATOR, for con-tinuous service up or down without reversing.May be arranged for self-dumping both ways,
Mechanical movements
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