Sharpening device
United States Patent 2187231

Inventors:
Frei Jr., John
Publication Date:
01/16/1940
View Patent Images:
Download PDF 2187231 pdf       PDF help
Export Citation:
Click for automatic bibliography generation
Assignee:
Frei Jr., John
Primary Class:
451/231
Other Classes:
451/382
International Classes:
B24B19/16; B24B19/00