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DK9175C - Telephoning apparatus for the clear transmission of high-distance tones. - Google Patents

Telephoning apparatus for the clear transmission of high-distance tones.

Info

Publication number
DK9175C
DK9175C DK9175DA DK9175C DK 9175 C DK9175 C DK 9175C DK 9175D A DK9175D A DK 9175DA DK 9175 C DK9175 C DK 9175C
Authority
DK
Denmark
Prior art keywords
tones
distance
clear transmission
telephoning
telephoning apparatus
Prior art date
Application number
Other languages
Danish (da)
Inventor
Victorien Tardieu
Original Assignee
Victorien Tardieu
Publication date
Application granted granted Critical
Publication of DK9175C publication Critical patent/DK9175C/en

Links

DK9175D Telephoning apparatus for the clear transmission of high-distance tones. DK9175C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK9175T

Publications (1)

Publication Number Publication Date
DK9175C true DK9175C (en) 1906-12-31

Family

ID=27825318

Family Applications (3)

Application Number Title Priority Date Filing Date
DK12024D DK12024C (en) Device by Microphones.
DK12538D DK12538C (en) Device by Microphones.
DK9175D DK9175C (en) Telephoning apparatus for the clear transmission of high-distance tones.

Family Applications Before (2)

Application Number Title Priority Date Filing Date
DK12024D DK12024C (en) Device by Microphones.
DK12538D DK12538C (en) Device by Microphones.

Country Status (1)

Country Link
DK (3) DK9175C (en)

Also Published As

Publication number Publication date
DK12538C (en) 1909-09-27
DK12024C (en) 1909-04-05

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