Set of capsules and case therefor for teaching the periodic tabl

Details Set of capsules and case therefor for teaching the periodic tabl Set of capsules and case therefor for teaching the periodic tabl

1993-05-21

1996-06-25

Word, A. Hugo

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

Patent

active

D03711625

REFERENCES:
patent: D134475 (1942-12-01), Emanuel
patent: D229563 (1973-12-01), Sirkin
patent: D328498 (1992-08-01), Runquist et al.
patent: 763926 (1904-06-01), Powers
patent: 1591639 (1926-07-01), McDonald
patent: 3654712 (1972-04-01), Bagdasar

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