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http://www.google.com/patents/US390820?utm_source=gb-gplus-share
Patent US390820 - OFFICE
OFFICE
NIKOLA TESLA
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Patent number
: 390820
Issue date
: Oct 9, 1888
Inventor
:
NIKOLA TESLA
Original Assignee
:
THE TESLA ELECTEIO COMPANY
Current U.S. Classification
:
388/826
;
318/244
;
318/246
;
318/739
;
336/120
;
388/827
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