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
  • H04M1/30—Devices which can set up and transmit only one digit at a time
  • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
• • 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
  • H04M1/18—Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment
• • 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
  • H04M1/30—Devices which can set up and transmit only one digit at a time
  • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
  • H04M1/34—Lost-motion or other arrangements for ensuring a pause between successive digit transmissions

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Telephone Set Structure (AREA)
• Transmission Devices (AREA)
• Telephone Function (AREA)
• Cash Registers Or Receiving Machines (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=26697092

Family Applications (1)

Country Status (3)

• 1924
  • 1924-07-14 GB GB16899/24A patent/GB234036A/en not_active Expired
  • 1924-07-14 GB GB18509/25A patent/GB237290A/en not_active Expired
• 1925
  • 1925-05-14 FR FR599575D patent/FR599575A/fr not_active Expired
• 1927
  • 1927-06-21 BE BE343067D patent/BE343067A/xx unknown
• 1930
  • 1930-04-08 GB GB11206/30A patent/GB352469A/en not_active Expired
  • 1930-09-19 FR FR39059D patent/FR39059E/fr not_active Expired

Also Published As

Similar Documents