FR490939A - Improvements to devices for the telephone transmission of sound - Google Patents

Improvements to devices for the telephone transmission of sound

Info

Publication number
FR490939A
FR490939A FR490939A FR490939DA FR490939A FR 490939 A FR490939 A FR 490939A FR 490939 A FR490939 A FR 490939A FR 490939D A FR490939D A FR 490939DA FR 490939 A FR490939 A FR 490939A
Authority
FR
France
Prior art keywords
sound
devices
telephone transmission
telephone
transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
FR490939A
Other languages
French (fr)
Inventor
Jesse Lee Spence
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of FR490939A publication Critical patent/FR490939A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/04—Supports for telephone transmitters or receivers
    • H04M1/05—Supports for telephone transmitters or receivers specially adapted for use on head, throat or breast
FR490939A 1918-05-02 1918-07-06 Improvements to devices for the telephone transmission of sound Expired FR490939A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US126284XA 1918-05-02 1918-05-02

Publications (1)

Publication Number Publication Date
FR490939A true FR490939A (en) 1919-05-15

Family

ID=32680050

Family Applications (1)

Application Number Title Priority Date Filing Date
FR490939A Expired FR490939A (en) 1918-05-02 1918-07-06 Improvements to devices for the telephone transmission of sound

Country Status (2)

Country Link
FR (1) FR490939A (en)
GB (1) GB126284A (en)

Also Published As

Publication number Publication date
GB126284A (en)

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