Title:
Method and apparatus for controlling the porosity of electrically perforated sheet material
United States Patent 2528158
Inventors:
Menke, Edward W.
Publication Date:
10/31/1950
Export Citation:
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Assignee:
Henry, Hay C.
Primary Class:
219/384
Other Classes:
156/253
International Classes:
B26F1/28; G01N15/08; B26F1/00; G01N15/08
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US Patent References:
2385246Method and apparatus for perforating sheet material
2365576Electroperforator
2282340Relaxation oscillator
2205255Register control of color printing presses
1929382Regulating device