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2420539
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Information
Patent Grant
2420539
References
Source
Patent Number
2,420,539
Date Filed
Not available
Date Issued
Tuesday, May 13, 1947
77 years ago
CPC
G05B11/013 - using discharge tubes
G01F1/372 - with electrical or electro-mechanical indication
US Classifications
340 - Communications: electrical
033 - Geometrical instruments
073 - Measuring and testing
177 - Weighing scales
318 - Electricity: motive power systems
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