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Chart 26 Light

W. M. Welch Manufacturing Company

30 x 42 in (75 x 107 cm)

ID #101462

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1950 1955 250-500 Chart 26. Light charts educational foot-candle meter industrial industry information informative institutional instructional invention inverse lenses light medium mirrors Original 1955 periscope product reflection refraction schools science scientific size-29-5x42 slick coating on surface; dimensions may vary slightly with each by about a 1/4 inch telescope US United States vintage poster W. M. Welch Manufacturing Company

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