Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M9/00—Arrangements for interconnection not involving centralised switching
  • H04M9/001—Two-way communication systems between a limited number of parties

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Circuit For Audible Band Transducer (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=19849261

Family Applications (1)

Country Status (4)

• 0
  • BE BE438929D patent/BE438929A/xx unknown
  • NL NL54610D patent/NL54610C/xx active
• 1940
  • 1940-05-08 FR FR865496D patent/FR865496A/fr not_active Expired
  • 1940-05-16 DE DEP80779D patent/DE726437C/de not_active Expired

Also Published As

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