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GB999314A
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Method of and apparatus for hoisting and lowering loads
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GB967330A
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Speed control system for alternating current induction motors
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US3136938A
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Braking circuit for a. c. hoist motor
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GB847048A
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Fuse protective system
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GB681316A
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Automatic dynamic braking compensation system for a.c. electric motors
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US2605454A
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Dynamic braking of electric motors
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US2525541A
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Automatic load compensation system for electric motors
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US2625627A
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High-voltage contactor system
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US2622173A
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Magnetic blowout system for high-voltage contactors
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CA503414A
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High voltage magnetic blowout airbreak contactor system
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CA525845A
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Vacuum relay
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CA582795A
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D. c. motor control
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CA522601A
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Spring clip contacts
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CA830131A
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Electrical interlock control circuit
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CA480437A
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Automatic electric switch and contactor system
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CA503416A
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Magnetic blowout system for high voltage contactors
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CA791851A
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Electromagnetic control means
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CA470330A
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Multiple contactors
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CA498777A
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Phase shifting systems
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CA789146A
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Polyphase full wave rectifier and control
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