Combination projector
United States Patent 1857135

Inventors:
Karl, Brenkert
Brenkert, Joseph W.
Publication Date:
05/10/1932
View Patent Images:
Download PDF 1857135 pdf       PDF help
Export Citation:
Click for automatic bibliography generation
Assignee:
Karl, Brenkert
Brenkert, Joseph W.
Primary Class:
353/34
Other Classes:
362/261, 353/37, 353/DIG.003, 352/136
International Classes:
G03B21/00