United States Patent 3123446
Publication Date:
03/03/1964
Other Classes:
29/896.620, 428/601, 428/596, 210/496
International Classes:
B21F27/18; B64C21/04; B64C21/06; B21F27/00; B64C21/00
US Patent References:
| 2711828 | Plastic fabric filter | | | |
| 2925650 | Method of forming perforate metal sheets | | | |