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| Keywords: 1817 brewster - kaleidoscope patent fig 4-5.jpg en Alternative positions of the reflectors in the kaleidoscope as illustrated in the 1817 patent 1817-07-10 https //books google nl/books id pgc1AAAAMAAJ pg PA321 lpg PA321 dq brewster+kaleidoscope+patent source bl ots GXgSUKiGDy sig QEP5GM9by0W1PNyDJ4dE500EkIQ hl en sa X ved 0ahUKEwiov8K9o_HQAhWIMBoKHa1zAj84ChDoAQg2MAg v onepage q f false David Brewster other versions PD-old-70-1923 Kaleidoscopes | ||||
