| http://www.w3.org/ns/prov#value | - The object of this invention is to provide an inexpensive indicator, the operation of which is simple and self evident to persons called upon to use it and which is so constructed as to permit the same to be made inexpensively of sanitary material.Notwithstanding the prior art, the present invention is neither taught nor rendered obvious thereby.SUMMARY OF THE INVENTIONThe present invention is a m
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