70 FICTITIOUS AMETHYSTS. Improved Soldering Furnace. HOLLINGWORTH'S SOLDERING HOW TO SET A SLIDE VALVE. TOGGLE JOINTS AS POWER., scientific american, 1865-07-29
70 FICTITIOUS AMETHYSTS. Improved Soldering Furnace. HOLLINGWORTH'S SOLDERING HOW TO SET A SLIDE VALVE. TOGGLE JOINTS AS POWER., scientific american, 1865-07-29
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