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Priority to AU13913/92ApriorityCriticalpatent/AU639404B3/en
Priority claimed from AU13913/92Aexternal-prioritypatent/AU639404B3/en
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Publication of AU639404B1publicationCriticalpatent/AU639404B1/xx
Publication of AU639404B3publicationCriticalpatent/AU639404B3/en
G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
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
G—PHYSICS
G08—SIGNALLING
G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS