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Patent US1578707 - ELECTROMAGNETIC DEVICE
ELECTROMAGNETIC DEVICE
W. O. BECK
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Abstract
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Description
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Patent number
: 1578707
Filing date
: Nov 20, 1922
Issue date
: Mar 30, 1926
Inventor
:
W. O. BECK
Original Assignee
:
WESTERN ELECTRIC COMPANY
Current U.S. Classification
:
335/81
;
200/303
;
335/83
;
335/86
;
439/680
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