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David H. Keeley

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Details David H. Keeley David H. Keeley

: Uncategorized

: Inventor
: Country: Canada

Affiliated with

Automatic electrical circuit switch

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Multiplex telegraphy

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Operation of long-line telegraph circuits

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Telephone instrument

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Telephone instrument

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Also associated with

Multiplex telegraphy

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Operation of long-line telegraph circuits

[ 0.00 ] – not rated yet Voters 0 Comments 0

Telephone instrument

[ 0.00 ] – not rated yet Voters 0 Comments 0

Telephone transmitter

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Profile ID: LFCA-PAI-P-23104

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