Item 12544 - W.H.C. Automatic Voltage Regulators, Portland Company, ca. 1904
- Item 12544 - W.H.C. Automatic Voltage Regulators, Portland Company, ca. 1904
- Contributed by Maine Historical Society
- Item 12544
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Image Info The Portland Company produced W.H.C. automatic voltage regulators, an important product for factories to use in operating machinery with either direct or alternating current.
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"W.H.C." is the initials of the inventor, William H. Chapman of Portland.