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Patent US430636 - ELECTRIC-CIRCUIT-CONTROLLING APPARATUS
ELECTRIC-CIRCUIT-CONTROLLING APPARATUS
EDWIN R. GILL
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Patent number
: 430636
Filing date
: Mar 30, 1888
Issue date
: Jun 24, 1890
Inventor
:
EDWIN R. GILL
Original Assignee
:
THE GILL
Current U.S. Classification
:
368/124
;
340/6.15
;
379/179
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