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3095476
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2907835
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2843679
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2833867
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2755796
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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2754372
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Patent number 2,754,372
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2559454
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2532060
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2522870
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2507188
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Patent number 2,507,188
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2482081
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2465288
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Patent number 2,465,288
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2436946
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2435140
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Patent number 2,435,140
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2432444
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2426061
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2423208
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2417712
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2397888
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2386049
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2376456
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2330697
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2225323
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G11 - INFORMATION STORAGE
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2033479
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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1909995
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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1804364
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H04 - ELECTRIC COMMUNICATION TECHNIQUE