THOMAS A. EDISON

GASES DESIGNED PRIMARILY FOR USE BY ANESTHETISTS, PHYSICIANS, AND DENTISTS, AND INCLUDING OXYGEN, NITROGEN, CYCLOPROPANE, HELIUM, NITRCUS OXIDE, COMPRESSED AIR, CARBON DIOXIDE AND OXYGEN MIXTURES, HELIUM AND OXYGEN MIXTURES, CARBON DIOXIDE, NITROGEN AND OXYGEN MIXTURES, AND NITROGEN AND CARBON DIOXIDE MIXTURES, AND FOR GAS-ABSORBING MATERIAL, PARTICULARLY GAS-ABSORBING MATERIAL COMPRISING A MIXTURE OF SOLID POROUS SUBSTANCES INCLUDING CALCIUM AND BARIUM HYDROXIDES AND ESPECIALLY ADAPTED UPON EXPOSURE TO GASEOUS MIXTURES TO ABSORB ACID GASES WHICH MAY BE PRESENT