Vented pen cap

Office supplies; artists and teachers materials – Equipment for writing – drawing – or for fine arts – Element or attachment

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Details

D19 56, D19 53, D19 51, 1906

Patent

active

D03841057

REFERENCES:
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patent: 4376590 (1983-03-01), Kuo
patent: 5221152 (1993-06-01), Chuang
Miller Office Products .COPYRGT.1994, see p. 763 circled pencil cap on item E, page center-desk copy.

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