Expanded plastic board having apertures retaining punched pieces
United States Patent 3280499

Inventors:
Studen, Charles E.
Publication Date:
10/25/1966
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Assignee:
Studen, Charles E.
Primary Class:
446/118
Other Classes:
273/DIG.004, 434/259, 273/156
International Classes:
A63F9/10; A63F9/06
US Patent References:
2001067Puzzle
2260183Punch press and punch and die set holder
2745492Punch for perforating sheets to receive the rings of mechanical bindings
3089704Shuttlecock
3165750Delay type lens consisting of multiple identical foamed blocks variably loaded by interlinking inserted rods