United States Patent 3240924
Inventors:
Darby, Joseph R.
Publication Date:
03/15/1966
Assignee:
Darby, Joseph R.
Other Classes:
362/111, 446/473, 463/51, 446/485
International Classes:
A63H5/04; F21V33/00; F41A33/02; F41G3/26; A63H5/00; F41A33/00; F41G3/00
US Patent References:
| 2928190 | Electric target-practice apparatus with time delay fixing means | | | |