|
2015
|
Invention
|
Machine to produce perforated metal stock.
A machine to form a plurality of perforations in an e... |
|
2008
|
Invention
|
Machine to produce expanded metal spirally lock-seamed tubing from solid coil stock. An apparatus... |
|
2003
|
Invention
|
Perforated spiral pipe. An improved filter pipe (23) is disclosed, and also an improved apparatus... |
|
2002
|
P/S
|
machine for forming and perforating tubes and pipes |
|
|
Invention
|
Perforated spiral pipe. An improved filter pipe is disclosed, and also an improved apparatus is d... |
|
1991
|
P/S
|
spiral tube-forming and perforation machines and parts therefor |
|
1989
|
Invention
|
Apparatus for forming and cutting spiral pipe. An apparatus for forming and slitting spirally for... |
