| http://www.w3.org/ns/prov#value | - One of the advantages of such a system is that it can work with solvents in the vapor form, in the liquid form or both, and it can work with a variety of different solvents, e.g. 1.1.1. trichloroethane, trichloroethylene, methylene chloride, perchloroethylene, freon, aldehydes, alcohols, amines, ketones, aromatics, or other solvents which may or may not be heavier than air.
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