Title:
Method and apparatus for controlling the porosity of electrically perforated opaque sheet material
United States Patent 2528157
US Patent References:
/2169818.html
- - 2169818
Register control of color printing presses
- - 2205255
Relaxation oscillator
- - 2282340
Electroperforator
- - 2365576
Method and apparatus for perforating sheet material
- - 2385246
/2169818.html
- - 2169818
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
View Patent Images:
Export Citation:
Assignee:
Henry, Hay C.
Primary Class:
Other Classes:
250/214R, 250/548, 219/502
International Classes:
H01J40/14; H01J40/00
Foreign References:
| GB605729A |