137,689.UNITED STATES PATENT OFFICE. Serial No.
FREQUENCY ETER
1,4 Specification tte Patent.
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NIKOLA TESLA, NEW YORK, ASSIGNOR ALTHAM WATCH COMPANY, OP
W ALTHAM MASSACHUSETTS, CORPORATION MASSACHUSETTS. lia rise its i-
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Application filed December 18, 1916. esla, iti- il,
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