Show MIXERS ns TO uSE GAS CAS MASKS MASES A lesson Jesson for lor miners has bas come out of ot the tho war In the adoption of ot the gas Jas gasmask mask mash as a safety device in underground workings For years cars ars tho the presence of oC gas sas in mines has been a a source ot of great danger and it Ina may now be he entirely removed by the tho use of ot gas sas masks aim aim- liar ilar in design to those thoo used h by the soldiers at the tho front frant in the recent connice con con- conflict nice |