CA564341A - Acoustical control apparatus - Google Patents

Acoustical control apparatus

Info

Publication number
CA564341A
CA564341A CA564341A CA564341DA CA564341A CA 564341 A CA564341 A CA 564341A CA 564341 A CA564341 A CA 564341A CA 564341D A CA564341D A CA 564341DA CA 564341 A CA564341 A CA 564341A
Authority
CA
Canada
Prior art keywords
control apparatus
acoustical control
acoustical
control
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
CA564341A
Other languages
French (fr)
Inventor
C. Eckel Oliver
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.)
Individual
Original Assignee
Individual
Publication date
Application granted granted Critical
Publication of CA564341A publication Critical patent/CA564341A/en
Expired legal-status Critical Current

Links

CA564341A Acoustical control apparatus Expired CA564341A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA564341T

Publications (1)

Publication Number Publication Date
CA564341A true CA564341A (en) 1958-10-07

Family

ID=35736841

Family Applications (1)

Application Number Title Priority Date Filing Date
CA564341A Expired CA564341A (en) Acoustical control apparatus

Country Status (1)

Country Link
CA (1) CA564341A (en)

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