FR509020A - Telephone system - Google Patents

Telephone system

Info

Publication number
FR509020A
FR509020A FR509020A FR509020DA FR509020A FR 509020 A FR509020 A FR 509020A FR 509020 A FR509020 A FR 509020A FR 509020D A FR509020D A FR 509020DA FR 509020 A FR509020 A FR 509020A
Authority
FR
France
Prior art keywords
telephone system
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
FR509020A
Other languages
French (fr)
Inventor
Carolus Robert Hend Arntzenius
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 FR509020A publication Critical patent/FR509020A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR509020A 1918-08-29 1919-07-18 Telephone system Expired FR509020A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL509020X 1918-08-29

Publications (1)

Publication Number Publication Date
FR509020A true FR509020A (en) 1920-10-29

Family

ID=19786883

Family Applications (1)

Application Number Title Priority Date Filing Date
FR509020A Expired FR509020A (en) 1918-08-29 1919-07-18 Telephone system

Country Status (1)

Country Link
FR (1) FR509020A (en)

Similar Documents

Publication Publication Date Title
FR502421A (en) Telephone transmitter
FR506293A (en) Telephone system
FR509020A (en) Telephone system
FR491585A (en) Pump system
FR494962A (en) Telephone jamming system
FR489960A (en) Carrier system
FR494997A (en) Carburetor system
FR22496E (en) Carburetor system
FR22476E (en) Carburetor system
DK22875C (en) Plovharve.
DK32324C (en) Signal system.
AT89732B (en) Telephone switching system.
DK26572C (en) Microphone.
FR494357A (en) Die system
CH103343A (en) Telephone installation.
DK32946C (en) Telephone exchange system.
DK33749C (en) Telephone exchange system.
DK27243C (en) Sound carrier.
DK33823C (en) Telephone system.
DK34337C (en) Telephone system.
DK35129C (en) Telephone system.
DK37946C (en) Telephone system.
AT89490B (en) Telephone system.
FR489434A (en) Lock system
CH81983A (en) Handset