The history of DC motors goes as far back as the 1830's and are now so customizable that they are widely used for applications across many industries.
DC Motors -- Background and history
News & Events Motor Specialty Inc.
DC Motor Manufacturers
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A Brief History of DC Motors - Motor Specialty Inc.
A Rich History
The History of Electric Motor Technology - PCB Stator Tech
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Electric motor - Wikipedia
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Brushed DC Motors and How to Drive Them
The DC Motor