Koff, Richard M. How does it work? Illus. by the author and Richard E. Rooman.

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Koff, Richard M.

How does it work? Illus. by the author and Richard E. Rooman.

Practical guide to the workings of everyday things from air conditioners to zippers.

Machinery.

Implements, utensils, etc.

Tools.

Electric apparatus and appliances.