Backrest frame of a chair

Design Patent

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Design Patent

active

D0510671

CLAIM:
The ornamental design for a backrest frame of a chair, as shown and described.

REFERENCES:
patent: D453079 (2002-01-01), Ma
patent: D477151 (2003-07-01), Koepke et al.
patent: D489191 (2004-05-01), Ma
patent: D493627 (2004-08-01), Ma
patent: D494768 (2004-08-01), Su
patent: D495509 (2004-09-01), Breen
patent: D497264 (2004-10-01), Aubriet et al.

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