DK62489C - Electric Tone Frequency Signaling System. - Google Patents

Electric Tone Frequency Signaling System.

Info

Publication number
DK62489C
DK62489C DK62489DA DK62489C DK 62489 C DK62489 C DK 62489C DK 62489D A DK62489D A DK 62489DA DK 62489 C DK62489 C DK 62489C
Authority
DK
Denmark
Prior art keywords
signaling system
tone frequency
frequency signaling
electric tone
electric
Prior art date
Application number
Other languages
Danish (da)
Original Assignee
Int Standard Electric Corp
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 Int Standard Electric Corp filed Critical Int Standard Electric Corp
Application granted granted Critical
Publication of DK62489C publication Critical patent/DK62489C/en

Links

DK62489D 1938-05-20 1939-05-17 Electric Tone Frequency Signaling System. DK62489C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB62489X 1938-05-20

Publications (1)

Publication Number Publication Date
DK62489C true DK62489C (en) 1944-07-24

Family

ID=9811101

Family Applications (1)

Application Number Title Priority Date Filing Date
DK62489D DK62489C (en) 1938-05-20 1939-05-17 Electric Tone Frequency Signaling System.

Country Status (1)

Country Link
DK (1) DK62489C (en)

Similar Documents

Publication Publication Date Title
CH210435A (en) Multiple telephone system.
FR856152A (en) Telephone system
FR859101A (en) Electrical networks
FR951376A (en) Telephone system
CH232790A (en) Electric telecommunication system.
CH276283A (en) Telephone installation.
FR849033A (en) Switchboard
DK62489C (en) Electric Tone Frequency Signaling System.
CH219021A (en) Electric telecommunication system.
US2254113A (en) Telephone system
DK59167C (en) Electrical Signaling System.
DK59149C (en) Electrical Signaling System.
DK59300C (en) Electrical Signaling System.
CH208095A (en) Multi-carrier frequency signaling system.
DK60155C (en) Electrical Signaling Cable.
CH227863A (en) Installation switch.
FR848445A (en) Telephone installation
DK57984C (en) Telephone system.
DK60396C (en) Electrical Remote Signaling Cable.
FR856679A (en) Electrical communications system
DK60137C (en) Submarine High Frequency Cable.
CH229316A (en) Telecommunications installation.
GR7138B (en) ELECTRIC MYPOGRAPHY.
GR7094B (en) ROTATED LIGHTING ELECTRICAL SYSTEM.
GR7612B (en) ELECTRICAL CONDUCT INSULATION SYSTEM.