Hand-held refractometer

Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Electrical property

Design Patent

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Design Patent

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D0510880

CLAIM:
We claim the ornamental design for a hand-held refractometer, as shown and described.

REFERENCES:
patent: 4890916 (1990-01-01), Rainer
patent: D348849 (1994-07-01), Thompson
patent: 5355211 (1994-10-01), Thompson et al.
patent: D364825 (1995-12-01), Brodeur et al.
patent: D371516 (1996-07-01), Guber et al.
patent: D381921 (1997-08-01), Siemon et al.
patent: D396814 (1998-08-01), Akeley
patent: 6195160 (2001-02-01), Rainer et al.
patent: 6816248 (2004-11-01), Sharma et al.

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