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I'm totally unfamiliar with this type of product, so I will describe it as best I can. Please email with questions and I'll do my best to answer them. On the plastic head strap it reads: "Type B.C.K. Pat. Nos. 20790 2111747 2360101". The knob for adjusting to fit reads: "Patents 2,205,741 and 2,205,742" This mask has seen considerable use. I've rinsed off the dust, but it remains very stained with what I assume are mechanical oils and greases. Purchase with Confidence – See Feedback Rating 100% Satisfaction Guaranteed or Money Refunded – No Questions Asked Use the FREE Counters 1 million sellers do - Andale! |
