Variable speed drive for electric motors

Equipment for production – distribution – or transformation of ene – Energy conversion or transformation – Transformer – rectifier or casing therefor

Design Patent

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Design Patent

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D0503379

CLAIM:
The ornamental design for a variable speed drive for electric motors, as shown and described.

REFERENCES:
patent: D305115 (1989-12-01), Kondo et al.
patent: D358753 (1995-05-01), Yoshida et al.
patent: D372017 (1996-07-01), Suematsu et al.
patent: D396688 (1998-08-01), Lin
patent: D410624 (1999-06-01), Loh
patent: D429687 (2000-08-01), Steiner et al.
patent: D438176 (2001-02-01), Cornu
patent: D456006 (2002-04-01), Maher et al.
patent: D477277 (2003-07-01), Noguchi et al.

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