A SIMPLE AND EFFICIENT GRAVITY HOIST. AN INEXPENSIVE PORTABLE FENCE. HARRIS' PORTABLE FENCE. A PORTABLE HOIST FOR HEAVY ARTICLES. A BINDER FOR PAPERS MAGAZINES ETC. FITZPATRICK AND RING'S BINDER. b. 1 Ow DOYLE'S GRAVITY HOISTING APPARATUS. BURNS' PORTABLE HOISTING MACHINE., scientific american, 1891-10-17
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