AN IMPROVED PARALLEL RULER. 41 ODDITIES IN INVENTIONS. Brief Notes Concerning Patents. IMPROVED PARALLEL RULER. COMBINED DOOR KNOB AND BELL. COMBINED PEPPER AND SALT SHAKER. AN ARTIFICIAL HAND. NOVEL REED INSTRUMENT. A SELF-LOCKING HOOK., scientific american, 1906-07-11
AN IMPROVED PARALLEL RULER. 41 ODDITIES IN INVENTIONS. Brief Notes Concerning Patents. IMPROVED PARALLEL RULER. COMBINED DOOR KNOB AND BELL. COMBINED PEPPER AND SALT SHAKER. AN ARTIFICIAL HAND. NOVEL REED INSTRUMENT. A SELF-LOCKING HOOK., scientific american, 1906-07-11
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