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Industrial supply places that cater to the asbestos removal industry. There used to be one in in City Of Industry, they will measure your face for small medium etc and do a smelling salts test. Look for a place that sell OSHA safety supplies.I used to have a full face, but I gave it to my late son. I shaved off my beard and use a large half face mask. For bone I do wet grinding as it smells disgusting, even this stabilized zebra bone I have. Ivory isn't supposed to be ground without special precautions as it's toxic.
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