Title:
AUTOMATIC FIRE ALARM DEVICE
Document Type and Number:
Japanese Patent JPS545698
Kind Code:
A
Abstract:
PURPOSE: To omit the extra signal transmission circuits and thus to reduce the cost by driving the electricity-sound converter via the audible frequency signal which piled on the detector circuit at the closing time of the sense contact.
Inventors:
KONDOU TSUTOMU
AKIYAMA KAZUHISA
AKIYAMA KAZUHISA
Application Number:
JP7234277A
Publication Date:
January 17, 1979
Filing Date:
June 15, 1977
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS LTD
International Classes:
G08B17/06; D06F41/00; G08B21/00; G08B23/00; G08B25/00; (IPC1-7): G08B17/06; G08B21/00
Next Patent: WIRELESS ANTI-BURGLAR DEVICE