CA622847A - Noise protective device - Google Patents

Noise protective device

Info

Publication number
CA622847A
CA622847A CA622847A CA622847DA CA622847A CA 622847 A CA622847 A CA 622847A CA 622847 A CA622847 A CA 622847A CA 622847D A CA622847D A CA 622847DA CA 622847 A CA622847 A CA 622847A
Authority
CA
Canada
Prior art keywords
protective device
noise protective
noise
protective
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
CA622847A
Inventor
E. Sietam Don
W. Austin Harry
R. Hornickel Robert
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.)
MSA Safety Inc
Original Assignee
Mine Safety Appliances Co
Publication date
Application granted granted Critical
Publication of CA622847A publication Critical patent/CA622847A/en
Expired legal-status Critical Current

Links

CA622847A Noise protective device Expired CA622847A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA622847T

Publications (1)

Publication Number Publication Date
CA622847A true CA622847A (en) 1961-06-27

Family

ID=35878031

Family Applications (1)

Application Number Title Priority Date Filing Date
CA622847A Expired CA622847A (en) Noise protective device

Country Status (1)

Country Link
CA (1) CA622847A (en)

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