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Scientific American, Vol. 64, No. 11 (March 1891) (1891)

leaf 3

An illustration from Scientific American, Vol. 64, No. 11 (March 1891), 1891, leaf 3
audience, the more so as it was thefirst appearance of Professor Thomson before histownspeople. )1891 SCIENTIFIC AMERICAN, INC. l62 ^tuniitit %mtxitM. [March 14, 1891. A WINDOW CLEANING BRUSH.A brush with which tlie upper as well as the lowersashes of windows may be readily cleaned, and withwhich… … MARTINOTS WINDOW CLEANING BRUSH. two or more sections, one section screwing into an-other to lengthen the handle. The end of the handlethus formed is screwed into a threaded aperture inone end of a horizontal plate, and into the other endof the plate is screwed a pole, also constructed of aseries…

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