Office supplies; artists and teachers materials – Teaching material
Patent
1996-05-02
1998-07-14
Burgess, Pamela J.
Office supplies; artists and teachers materials
Teaching material
D19 1, 434282, 1907
Patent
active
D03960609
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patent: 3390468 (1968-07-01), Mitchell
patent: 3960046 (1976-06-01), Choong
1870 H. Baumhauer in "The Periodic System of the Chemical Elements", J.W. van Spronsen, 1969, p. 141.
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1928 C. Janet in "Graphic Representations of the Periodic System During One Hundred Years", E.G. Mazurs, 1974, p. 89.
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F. Scheele, Z. Naturforsch., vol. 5a (1950) p. 12.
1950 F. Scheele in Mazurs, p. 133.
Fisher Scientific Co., 1964 Periodic Chart of the Elements.
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