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Variable speed control switch for direct current electric power

Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent

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Variable speed D.C. motor control

Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent

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Variable speed latching motor control

Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Analog armature control
Patent

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Vehicle motor switching apparatus

Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Field control – or field and armature control – by analog...
Patent

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Ventilation system for a motor vehicle

Electricity: motor control systems – Closed loop speed control system for dc motor with commutator
Reexamination Certificate

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Volumetric flow equalizing drive control wheel

Electricity: motor control systems – Closed loop speed control system for dc motor with commutator
Patent

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Wheel chair drive apparatus and method

Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Reexamination Certificate

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