G - Physics – 03 – B
Patent
G - Physics
03
B
G03B 21/132 (2006.01) G03G 7/00 (2006.01)
Patent
CA 2146762
A sheet of imageable film (12, 14) for use in an overhead projector is provided with at least one, and preferably two, opaque flaps (20, 22) attached in a foldable manner to the film so that the flaps (20, 22) may be unfolded to prevent unwanted light from shining past the edges of the transparency.
Evans Dwight Lamar
Herbert Alan John
Russell Terrance James
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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