Document Type and Number:
United States Patent 1911652

Publication Date:
05/30/1933
View Patent Images:
Images are available in PDF form when logged in. To view PDFs, Login  or  Create Account (Free!)
Referenced by:
View patents that cite this patent
Export Citation:
Click for automatic bibliography generation
Primary Class:
74/3.520
Other Classes:
968/616, 49/29, 200/40
International Classes:
G04C23/22; G04C23/00




<- Previous Patent   |   Next Patent ->