FR539569A - Improvements to telephone transmitters - Google Patents

Improvements to telephone transmitters

Info

Publication number
FR539569A
FR539569A FR539569DA FR539569A FR 539569 A FR539569 A FR 539569A FR 539569D A FR539569D A FR 539569DA FR 539569 A FR539569 A FR 539569A
Authority
FR
France
Prior art keywords
telephone transmitters
transmitters
telephone
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
Other languages
French (fr)
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.)
TELEPHONE Manufacturing Co 1920 Ltd
Original Assignee
TELEPHONE Manufacturing Co 1920 Ltd
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 TELEPHONE Manufacturing Co 1920 Ltd filed Critical TELEPHONE Manufacturing Co 1920 Ltd
Application granted granted Critical
Publication of FR539569A publication Critical patent/FR539569A/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
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
FR539569D 1920-10-01 1921-08-22 Improvements to telephone transmitters Expired FR539569A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB539569X 1920-10-01

Publications (1)

Publication Number Publication Date
FR539569A true FR539569A (en) 1922-06-28

Family

ID=10469521

Family Applications (1)

Application Number Title Priority Date Filing Date
FR539569D Expired FR539569A (en) 1920-10-01 1921-08-22 Improvements to telephone transmitters

Country Status (2)

Country Link
DE (1) DE362450C (en)
FR (1) FR539569A (en)

Also Published As

Publication number Publication date
DE362450C (en) 1922-10-27

Similar Documents

Publication Publication Date Title
FR540819A (en) Improvements to radio-receivers
FR27035E (en) Improvements to telephone transmitters
FR540287A (en) Improvements relating to manometers
FR24721E (en) Improvements to radio-receivers
FR508443A (en) Improvements to telephone transmitters
FR523062A (en) Improvements to v-mandrels.
FR511814A (en) Improvements to telephone transmitters
FR539569A (en) Improvements to telephone transmitters
FR525171A (en) Improvements to the pavilions of telephone transmitters
FR530138A (en) Improvements to keys
FR556412A (en) Improvements to speaker phones
FR541218A (en) Improvements to strawberries
FR547572A (en) Improvements to telephone receivers
FR516331A (en) Improvements to talking machines
FR542433A (en) Improvements to phones
FR534500A (en) Improvements to constructions
FR523592A (en) Improvements to totalizers
FR508678A (en) Improvements to telephone transmitters
FR508334A (en) Improvements to telephone equipment
FR536736A (en) Improvements to telephone receivers
FR25839E (en) Improvements to telephone receivers
FR530245A (en) Phone enhancements
FR530244A (en) Phone enhancements
FR517367A (en) Improvements to cinematographs
FR527344A (en) Improvements to vices-filers