Title:
Ink-content-indicating fountain-pen
United States Patent 1372608


Inventors:
Echevarria, Ramon DE.
Application Number:
US36989620A
Publication Date:
03/22/1921
Filing Date:
03/30/1920
Assignee:
Echevarria, Ramon DE.
Primary Class:
Other Classes:
401/192, 401/194
International Classes:
B43K5/12
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