Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M1/00—Substation equipment, e.g. for use by subscribers
  • H04M1/26—Devices for calling a subscriber
  • H04M1/515—Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L17/00—Apparatus or local circuits for transmitting or receiving codes wherein each character is represented by the same number of equal-length code elements, e.g. Baudot code
  • H04L17/02—Apparatus or circuits at the transmitting end
  • H04L17/04—Apparatus or circuits at the transmitting end with keyboard co-operating with code-bars
  • H04L17/06—Contact operating means
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M1/00—Substation equipment, e.g. for use by subscribers
  • H04M1/26—Devices for calling a subscriber

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Computer Networks & Wireless Communication (AREA)
• Structure Of Telephone Exchanges (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=9558516

Family Applications (1)

Country Status (4)

Families Citing this family (2)

• 0
  • BE BE465816D patent/BE465816A/xx unknown
• 1945
  • 1945-07-05 FR FR997292D patent/FR997292A/en not_active Expired
• 1946
  • 1946-06-07 CH CH258153D patent/CH258153A/en unknown
  • 1946-07-03 GB GB19886/46A patent/GB665816A/en not_active Expired

Also Published As

Similar Documents