it is never safe to use poisonous compounds. if you are asking this, you shouldn't be using such compounds, i fear by the time i answer your question you will allready be dead. :(
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No, It was made post ww2 where they stopped using asbestos in the filters. 100% safe.
while saving someone with a room covered with gas ANSWER: No, ww2 gas masks are old, breathing gas masks dated in the 50's and below contain asbestos.
What do you mean by safe, for the environment, YES
This is stamp of JAPWANCAP - "The Japanese War Notes Claimants Association of the Philippines, Inc." - organisation, created after WWII for suing the USA and Japan for reciprocity and lost. Without success, of course :)
A civil war safe house is a place where slaves hid from the slave hunters.