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Patent US447920 - NIKOLA TESLA
NIKOLA TESLA
NIKOLA TESLA
› Overview
Abstract
Drawings
Description
Claims
Patent number
: 447920
Filing date
: Oct 1, 1890
Issue date
: Mar 10, 1891
Inventor
:
NIKOLA TESLA
Current U.S. Classification
:
315/246
;
310/40.00R
;
310/180
;
315/326
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