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Patent US199141 - IMPROVEMENT IN TELEPHONES
IMPROVEMENT IN TELEPHONES
BMILB BERLINEB
› Overview
Abstract
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Description
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Patent number
: 199141
Filing date
: Oct 16, 1877
Issue date
: Jan 15, 1878
Inventor
:
BMILB BERLINEB
Current U.S. Classification
:
379/167.01
;
379/391
;
381/178
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