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US Patent: 900,420
Variable Speed Motor
Patentees:
Charles E. F. Ahlm (exact or similar names) - Cleveland, Cuyahoga County, OH
Alvin A. Pifer (exact or similar names) - Cleveland, Cuyahoga County, OH

USPTO Classifications:
310/191

Tool Categories:
electrical devices : electric motors : variable speed motors

Assignees:
F. B. Wagner - Cleveland, Cuyahoga County, OH

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Feb. 14, 1906
Granted: Oct. 06, 1908

Patent Pictures:
USPTO (New site tip)
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