A security alarm system includes a transponder having a housing enclosing both a sensor and associated circuit means in a unitary package. The housing base includes barrel-shaped connectors, and a pc board carrying the communications components is carried by the housing cover. Flag-like connectors mate...http://www.google.es/patents/US4990888?utm_source=gb-gplus-sharePatente US4990888 - Unitary alarm sensor and communication package for security alarm system
Unitary alarm sensor and communication package for security alarm system
