Kerite
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A compound in which tar or asphaltum combined with animal or vegetable oils is vulcanized by sulphur, the product closely resembling rubber; -- used principally as an insulating material in telegraphy.
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A compound in which tar or asphaltum combined with animal or vegetable oils is vulcanized by sulphur, the product closely resembling rubber; -- used principally as an insulating material in telegraphy.