30 x 42 in (75 x 107 cm)
ID #101462
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
Butagaz Poster #6
France, c. 1948
Matelas Dunlopillo
France, c. 1930s
Spécialité de Tuyaux d'Incendie pour Haute Pression Henri Vanrullen
France, c. 1900s (?)
Invicta Suisse
Switzerland, c. 1950s (?)
Osram 1/2 Watt Lampen
Netherlands, c. 1920s (?)
Wall Plates for the Education in Natural History: Conifers
Austria, c. 1890
