2439766

Information

• Patent Grant
• 2439766

• References
• Source

• Patent Number

  2,439,766

• Date Filed

  Not available

• Date Issued

  Tuesday, April 13, 1948
  76 years ago

• CPC

  • G08B7/06 - using electric transmission
  • G08B7/00 - Signalling systems according to more than one of groups G08B3/00 - G08B6/00 Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
  • G08B7/02 - using mechanical transmission
  • Y10T307/461 - Selectively connected or controlled load circuits
  • Y10T307/74 - Switching systems

• US Classifications

  • 340 - Communications: electrical
  • 307 - Electrical transmission or interconnection systems