United States Patent 2320743
Inventors:
Nicolai, Nilsen
Christofferson, Thorvald R.
Publication Date:
06/01/1943
Assignee:
Nicolai, Nilsen
Christofferson, Thorvald R.
Other Classes:
83/486.100, 125/13.030, 83/643, 83/478
International Classes:
B27B5/18; B27B5/00