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GB468904A
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Improvements relating to electric contact devices
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GB439641A
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Improvements relating to contact mechanisms for controlling electric circuits
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GB435882A
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Improvements relating to contact fingers for electric circuit controllers
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GB434556A
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Improvements relating to controlling apparatus for electric motors
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GB419085A
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Improvements relating to automatic electric circuit-breakers
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DE617032C
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Electrical contact device to be controlled by rotating cam or rolling curve parts
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GB409024A
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Improvements relating to electric contact devices of the drum type
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GB401057A
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Improvements relating to electric contact devices
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GB389662A
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Improvements relating to tramway and other vehicle brakes
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GB386762A
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Improvements relating to the control of electric motors
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GB384433A
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Improvements relating to control mechanisms for electrically propelled road and rail
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GB391890A
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Improvements relating to electric trolley bus brakes
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