Cardboard box from 3M Company labeled “IMPERIAL / SANDPAPER / 8 3/4 x 10 1/2 / MINNESOTA MINING & MFG. CO. – ST.PAUL, MINN. / REG. U.S. PAT OFF. / 3MCo [LOGO] / B-A / SINCE 1828 / MADE IN U.S.A. BY / MINNESOTA MINING & MFG. CO. / SAINT PAUL, MINNESOTA / REG. U.S. PAT OFF.” Early twentieth century.
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