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Mary MacCracken's husband, Calvin Dodd MacCracken, was an MIT graduate and inventor who held over 80 patents and also founded his own Creative Engineering Firm, JetHeat Inc. (Now known as CalMac, Inc.). Some notable inventions of his include the residential forced air furnace, an electric hot-dog cooker, and even the temperature distribution system for the Apollo Astronauts' space suits. Mr. MacCracken is also the author of "A Handbook for Inventors" (1983).

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