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Samuel Slaymaker had become interested in switch and signal locks while working for the Pennsylvania Railroad as a civil engineer. In 1894 the company was reorganized and renamed the Slaymaker–Barry Company with Samuel Slaymaker as the principal stock holder, and John Barry and William F. Troast as junior partners.
3 Australian light switches and a "neon" indicator—in a 4-gang wall-plate. The lower switch is in the "on" or "down" position. Two Australian rocker switches (disassembled), together with a cutaway view, and a view of the switch connections An Australian architrave-mounted 2-gang switch plate and switches.
DOMELRE refrigerator advertisement from 1914 DOMELRE refrigerator c. 1914 ISKO advertisement from Good Housekeeping 1917. DOMELRE (an acronym of Domestic Electric Refrigerator) was one of the first domestic electrical refrigerators, invented by Frederick William Wolf Jr. (1879–1954) in 1913 and produced starting in 1914 by Wolf's Mechanical Refrigerator Company in Chicago.
A Single-Pole, Single-Throw (SPST) mercury switch on millimetre graph paper, device length approximately 1.5 cm Another mercury switch design. A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit.
Florence Wilhelmina [1] Parpart Layman (January 1873 [2] - December 3, 1930 [3]), most commonly known by her maiden name of Florence Parpart, was an American inventor known primarily for her patents for an industrial sweeping machine [4] and electrical refrigerator.
Another type of surface mounted door closer is attached to the door frame behind the door (where the hinges are) next to the middle hinge. The "arm" (tail) rests against the door, and a spring that is twisted by the user opening the door closes the door by returning to its pre-twisted shape.
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