Sign up
Title:
Ballot or the like
United States Patent 3294424
Inventors:
Mathews, David D.
Application Number:
US49527465A
Publication Date:
12/27/1966
Filing Date:
10/12/1965
Assignee:
Mathews, David D.
Primary Class:
Other Classes:
235/489, 281/15.1, 283/5, 434/306
International Classes:
G06K19/00
View Patent Images:
US Patent References:
2932095Game book1960-04-12
2295818Device for recording answers to examination questions1942-09-15
2052369N/A1936-08-25
1500777Permanent test and practice form1924-07-08
1350914Ballot1920-08-24