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Patent US5398367 - Toothbrush with both soft and hard ...
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Patent US5398367 - Toothbrush with both soft and hard ...
Website URL:
http://www.google.com/patents/US5398367
Category:
Massagers
A toothbrush comprises both soft and hard bristles. The soft bristles are longer while the hard bristles are shorter. With less force, only the soft bristles are used ...
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