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Expired
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Horatio Sheaf
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Individual
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Individual
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Publication of GB190812471ApublicationCriticalpatent/GB190812471A/en
12,471. Sheaf, H. June 10. Displaying and storing.-Maps, plans, pictures, drawings, designs, &c, are mounted on two externally-operated removable rollers f<1> contained in a box or frame a, to which blackboards c are hinged, one of the sides b of the frame also forming a blackboard. The sheet travels over a supporting- board g and is guided by hinged side flaps h.
GB190812471D1908-06-101908-06-10Improvements in Blackboards
ExpiredGB190812471A
(en)