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US3022426A
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Regulator
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US2853580A
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Switch
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US2825865A
|
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Automatic constant current regulator employing a saturable transformer
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US2907857A
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Heating apparatus
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US2769695A
|
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Endothermic generator retort
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US2787732A
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Constant current regulator system
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US2787733A
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Power distribution system
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US2602150A
|
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High-speed brightness switching for static type constant current regulators
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US2611790A
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Electric heat treating furnace
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US2600441A
|
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Method of manual door operation of vertically movable doors
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US2332943A
|
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Carbon combustion furnace
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US2202874A
|
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Heating element mounting construction
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GB394700A
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Improvements in processes for carburizing or nitrogenizing ferrous or ferrous alloy articles
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US2012165A
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Heat treating in circulatory gases
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GB366409A
|
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Improvements in rotary hearth furnaces
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US1858764A
|
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Belt conveyer
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US1861687A
|
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Magnetic control system
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US1913386A
|
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Vertical retort furnace
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US1884748A
|
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Heat treatment system
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US1966466A
|
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Electrically heated electric fuse circuit
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