Patents
- US PAT No. 2,353,063: July 4, 1944
- US PAT No. 2,031,409: February 18, 1936
- US PAT No. 2,031,416: February 18, 1936
- US PAT No. 2,162,897: June 20, 1939
- US PAT No. 2,174,446: September 26, 1939
Read more about this topic: Bubble Light
Patents
Read more about this topic: Bubble Light