230000029058 respiratory gaseous exchange Effects 0.000 description 2.238000007906 compression Methods 0.000 claims description 4. 239000000463 material Substances 0.000 claims description 6.230000000717 retained Effects 0.000 claims abstract description 12.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority claimed from US23842472A external-priority Application filed by SANDMASTER CO filed Critical SANDMASTER CO Application granted granted Critical Publication of US3710562A publication Critical patent/US3710562A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Original Assignee SANDMASTER CO Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US00238424A Inventor M Mckenzie Current Assignee (The listed assignees may be inaccurate. Google Patents US3710562A - Dual element air filterÄownload PDF Info Publication number US3710562A US3710562A US00238424A US3710562DA US3710562A US 3710562 A US3710562 A US 3710562A US 00238424 A US00238424 A US 00238424A US 3710562D A US3710562D A US 3710562DA US 3710562 A US3710562 A US 3710562A Authority US United States Prior art keywords filter base member air cover filters Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
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