CA445020A - Audible signalling device - Google Patents

Audible signalling device

Info

Publication number
CA445020A
CA445020A CA445020A CA445020DA CA445020A CA 445020 A CA445020 A CA 445020A CA 445020 A CA445020 A CA 445020A CA 445020D A CA445020D A CA 445020DA CA 445020 A CA445020 A CA 445020A
Authority
CA
Canada
Prior art keywords
signalling device
audible signalling
audible
signalling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA445020A
Other languages
French (fr)
Inventor
W. Gent Edgar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
Western Electric Co Inc
Bell Telephone Laboratories Inc
Publication date
Application granted granted Critical
Publication of CA445020A publication Critical patent/CA445020A/en
Expired legal-status Critical Current

Links

CA445020A Audible signalling device Expired CA445020A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA445020T

Publications (1)

Publication Number Publication Date
CA445020A true CA445020A (en) 1947-11-11

Family

ID=35562671

Family Applications (1)

Application Number Title Priority Date Filing Date
CA445020A Expired CA445020A (en) Audible signalling device

Country Status (1)

Country Link
CA (1) CA445020A (en)

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