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MSA Safety Inc
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MSA Safety Inc
Mine Safety Appliances Co
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G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators
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FR53168A1966-03-111966-03-11Procédé et dispositif pour l'analyse qualitative et quantitative de l'oxygène dans un mélange gazeux
ExpiredFR1471049A
(fr)