United States Patent 3473879
Inventors:
Berberich, Bertold
Publication Date:
10/21/1969
Other Classes:
60/39.821, 65/337, 65/DIG.004, 60/39.760, 123/143B, 431/258, 65/111, 219/121.600
International Classes:
F23C15/00; F23C99/00; H01S3/00; F23C3/02; H01S3/00