AN IMPROVED PULVERIZER. AN AUTOMATIC CUT-OUT AND LIGHTNING ARRESTER. IMPROVED ROTARY VENTILATOR. BRIGGS' IMPROVED ROTARY VENTILATOR A Use for Fire Damp. Instrument for Reproducing at Will an Invariable Quantity of Electricity. LIGHTNING ARRESTER AND AUTOMATIC CUT-OUT. BELT'S CUT-OUT AND LIGHTNING ARRESTER. HOWLAND'S IMPROVED PULVERIZER., scientific american, 1886-05-08
Keywords:
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