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Quadraspheric Trademarks
QUADRASPHERIC
diagnostic/therapeutic lens for diagnosis and treatment of eye diseases
Registered
·
August 27, 1997
·
75347631
·
QUADRASPHERIC
diagnostic optical lens
Cancelled
·
March 12, 1990
·
74037399
·
QUADRASPHERIC NF
ophthalmoscopy lenses
Cancelled
·
January 8, 1992
·
74236060
·
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