Разлика между версии на „Своевременна подмяна на респираторните филтри“

<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="Stetter-1991">{{cite journal|last =Maclay G.J., Yue C., Findlay M.W. and Stetter J.R |title=A prototype active end-of-service-life indicator for respirator cartridges |lang=en|изданиеjournal=Applied Occupational and Environmental Hygiene|publisher=Taylor and Francis|year=2001|volume=6|issue=8|pages=677—682|issn=1047-322X |doi=10.1080/1047322X.1991.10387960 }}
 
Stetter J.R. and Maclay G.J. (1996) Chemical sensing apparatus and methods, Transducer Research Inc., [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=5512882.PN.&OS=PN/5512882&RS=PN/5512882 Patent No. US5512882 ]</ref>
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