A - Human Necessities – 61 – C
Patent
A - Human Necessities
61
C
83/1
A61C 7/00 (2006.01) A61C 7/08 (2006.01)
Patent
CA 1082499
ABSTRACT OF THE DISCLOSURE An orthodontic appliance having the property of changing its opacity during use to thereby give an indication of patient wear thereof, The material of the appliance comprises a mixture of non-water-blush polyvinyl chloride with at least 5% of water- blush polyvinyl chloride.
210932
Bergersen Earl O.
Fetherstonhaugh & Co.
LandOfFree
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