Разлика между версии на „Своевременна подмяна на респираторните филтри“

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<ref name="Magnante-1979">Magnante P.C. (1979) Respirator cartridge end-of-service life indicator, American Optical Corporation, [http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=4146887.PN.&OS=PN/4146887&RS=PN/4146887 Patent No. US4146887.]</ref>
<ref name="Freidank-1918"> Freidank M., Coym J. and Schubert A. (1989) Warning device to indicate the state of gases exhaustion of a gas filter retaining dangerous gases, Auergesellschaft GMBH, [http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=4873970.PN.&OS=PN/4873970&RS=PN/4873970 Patent No. US4873970]</ref>
<ref name="Shigematsu">Shigematsu Y., Kurano R. and Shimada S. (2002) Gas mask having detector for detecting timing to exchange absorption can, Shigematsu Works Co Ltd and New Cosmos Electric Corp., Patent No. JP2002102367</ref>
<ref name="Stetter-1991">{{статья|автор=Maclay G.J., Yue C., Findlay M.W. and Stetter J.R |заглавие=A prototype active end-of-service-life indicator for respirator cartridges|ссылка= |язык=en|автор издания= AIHA & ACGIH|издание=Applied Occupational and Environmental Hygiene|место=|издательство=Taylor and Francis|год=2001|том=6|выпуск=8|страницы=677—682|issn=1047-322X |doi=10.1080/1047322X.1991.10387960 }}
 
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