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3624559
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H03 - BASIC ELECTRONIC CIRCUITRY
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3136949
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H03 - BASIC ELECTRONIC CIRCUITRY
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3129391
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H03 - BASIC ELECTRONIC CIRCUITRY
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3061801
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A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
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2614246
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H03 - BASIC ELECTRONIC CIRCUITRY
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2579590
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H03 - BASIC ELECTRONIC CIRCUITRY
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2548855
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H03 - BASIC ELECTRONIC CIRCUITRY
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2524992
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H03 - BASIC ELECTRONIC CIRCUITRY
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2516862
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H03 - BASIC ELECTRONIC CIRCUITRY
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2515971
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Patent number 2,515,971
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2508270
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Patent number 2,508,270
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H03 - BASIC ELECTRONIC CIRCUITRY
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2502095
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H03 - BASIC ELECTRONIC CIRCUITRY
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2442317
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H03 - BASIC ELECTRONIC CIRCUITRY
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2440621
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H03 - BASIC ELECTRONIC CIRCUITRY
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2402148
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H03 - BASIC ELECTRONIC CIRCUITRY
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2374000
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H03 - BASIC ELECTRONIC CIRCUITRY
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2353203
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H03 - BASIC ELECTRONIC CIRCUITRY
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2326314
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H03 - BASIC ELECTRONIC CIRCUITRY
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2318934
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H03 - BASIC ELECTRONIC CIRCUITRY
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2312977
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Patent number 2,312,977
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2309083
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Patent number 2,309,083
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H03 - BASIC ELECTRONIC CIRCUITRY
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2305882
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H03 - BASIC ELECTRONIC CIRCUITRY
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2304388
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Patent number 2,304,388
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H03 - BASIC ELECTRONIC CIRCUITRY
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2303863
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H03 - BASIC ELECTRONIC CIRCUITRY
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2298092
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H03 - BASIC ELECTRONIC CIRCUITRY
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2296206
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H03 - BASIC ELECTRONIC CIRCUITRY
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2250295
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Patent number 2,250,295
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2250296
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Patent number 2,250,296
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2231854
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2225691
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Patent number 2,225,691
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H03 - BASIC ELECTRONIC CIRCUITRY