Radiotherapy equipment maker Varian Medical Systems ( VAR - Get Report) said Monday that its board approved to repurchase up to an additional 4.5 million shares of its stock over a nine-month period extending through Sept. 27, 2007.

The Palo Alto, Calif.-based company said that as of the end of fiscal 2006, it had repurchased about 4.5 million shares under an existing six million share repurchase program ending in December.

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