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Insulating oil
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Patent number 3,959,162
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Issue date May 25, 1976
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Nissin Electric Co., Ltd.
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Mineaki Nishimatsu
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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Oil filled electrical device
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Patent number 3,937,664
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Issue date Feb 10, 1976
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Nissin Electric Co., Ltd.
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Fumio Tanimoto
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...