Title:
Method and apparatus for controlling the porosity of electrically perforated sheet material
United States Patent 2528158
US Patent References:
Regulating device
- - 1929382
Register control of color printing presses
- - 2205255
Relaxation oscillator
- - 2282340
Electroperforator
- - 2365576
Method and apparatus for perforating sheet material
- - 2385246
Regulating device
- - 1929382
Register control of color printing presses
- - 2205255
Relaxation oscillator
- - 2282340
Electroperforator
- - 2365576
Method and apparatus for perforating sheet material
- - 2385246
Inventors:
Menke, Edward W.
Publication Date:
10/31/1950
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Export Citation:
Assignee:
Henry, Hay C.
Primary Class:
Other Classes:
156/253
International Classes:
B26F1/28; G01N15/08; B26F1/00