The Calvert Group of Bethesda, Md., has added a new screen on its "Know What You Own" web site mechanism, which gives investors the ability to find out if a mutual fund holds stock in companies in the firearms industry, according to a company announcement.

The screening device is available on the home page of the Calvert website. Investors can type in the name of a mutual fund and screen for firearms firms as well as for those that sell tobacco-related products. The site also lists the top holdings in funds.

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