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Chart 7 Energy Force Work And Power

W. M. Welch Manufacturing Company
30 x 42 in (75 x 107 cm)
ID #101460
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1950 1955 250-500 Chart 7. Energy charts climbing stairs educational efficiency energy Force friction industrial industry information informative institutional instructional invention kinetic medium Original 1955 potential power product autocycles schools science scientific slick coating on surface; dimensions may vary slightly with each by about a 1/4 inch US United States vintage poster W. M. Welch Manufacturing Company water work Work and Power

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