Nothing has really changed since 1960  as far as the fitting instructions go. The mask is almost the same. Maybe a few changes to the type of rubber or silicone used in the mask. Just remember make sure your mask fits the purpose it is intended for. http://www.youtube.com/watch?v=UVCeYXtXmvQ   So this is the one I … Continue reading MAKING SURE YOUR GAS MASK PROPERLY FITS…