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Respirator valve for respirators
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Patent number 4,172,467
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Issue date Oct 30, 1979
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Dragerwerk Aktiengesellschaft
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Detlef Warnow
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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3587628
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Patent number 3,587,628
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Issue date Jun 28, 1971
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G05 - CONTROLLING REGULATING
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3575203
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Patent number 3,575,203
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Issue date Apr 20, 1971
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G05 - CONTROLLING REGULATING
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3417918
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Patent number 3,417,918
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Issue date Dec 24, 1968
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G05 - CONTROLLING REGULATING
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3402889
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Patent number 3,402,889
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Issue date Sep 24, 1968
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G05 - CONTROLLING REGULATING
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3391784
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Patent number 3,391,784
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Issue date Jul 9, 1968
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G05 - CONTROLLING REGULATING
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3256903
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Patent number 3,256,903
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Issue date Jun 21, 1966
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
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2879793
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Patent number 2,879,793
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Issue date Mar 31, 1959
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G05 - CONTROLLING REGULATING
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2858845
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Patent number 2,858,845
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Issue date Nov 4, 1958
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G05 - CONTROLLING REGULATING
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2777432
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Patent number 2,777,432
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Issue date Jan 15, 1957
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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2731026
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Patent number 2,731,026
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Issue date Jan 17, 1956
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G05 - CONTROLLING REGULATING
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2647345
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Patent number 2,647,345
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Issue date Aug 4, 1953
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G05 - CONTROLLING REGULATING
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2308187
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Patent number 2,308,187
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Issue date Jan 12, 1943
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G05 - CONTROLLING REGULATING
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2288024
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Patent number 2,288,024
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Issue date Jun 30, 1942
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G05 - CONTROLLING REGULATING
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2286188
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Patent number 2,286,188
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Issue date Jun 16, 1942
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G05 - CONTROLLING REGULATING
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2042906
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Patent number 2,042,906
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Issue date Jun 2, 1936
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G05 - CONTROLLING REGULATING
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2035151
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Patent number 2,035,151
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Issue date Mar 24, 1936
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G05 - CONTROLLING REGULATING
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1960466
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Patent number 1,960,466
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Issue date May 29, 1934
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G05 - CONTROLLING REGULATING
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1679215
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Patent number 1,679,215
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Issue date Jul 31, 1928
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G05 - CONTROLLING REGULATING
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1335903
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Patent number 1,335,903
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Issue date Apr 6, 1920
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G05 - CONTROLLING REGULATING