A62B18/00- Breathing masks or helmets, e.g. A62B- DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING. F16K15/147- Check valves with flexible valve members the closure elements being fixed along all or a part of their periphery the closure elements having specially formed slits or being of an elongated easily collapsible form. F16K15/144- Check valves with flexible valve members the closure elements being fixed along all or a part of their periphery. F16K15/14- Check valves with flexible valve members. F16K- VALVES TAPS COCKS ACTUATING-FLOATS DEVICES FOR VENTING OR AERATING. F16- ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS THERMAL INSULATION IN GENERAL. F- MECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING. 238000006011 modification reaction Methods 0.000 description 6. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by MSA Safety Inc filed Critical MSA Safety Inc Priority to US747437A priority Critical patent/US1680757A/en Application granted granted Critical Publication of US1680757A publication Critical patent/US1680757A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Original Assignee MSA Safety Inc 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 US747437A Inventor Yablick Max Current Assignee (The listed assignees may be inaccurate.
#Pickle flutter valve pdf
Google Patents US1680757A - Flutter valveĭownload PDF Info Publication number US1680757A US1680757A US747437A US74743724A US1680757A US 1680757 A US1680757 A US 1680757A US 747437 A US747437 A US 747437A US 74743724 A US74743724 A US 74743724A US 1680757 A US1680757 A US 1680757A Authority US United States Prior art keywords valve neck wall walls sound Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
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