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Conversion. Rendering of household fats. Cans filled with reclaimed household grease are dumped into pressure cookers at a rendering plant. Often they are prepared the way the householder does. The cooker melts the greases, and the empty cans are removed for detinning. Other types of cookers remove grease from cans by steam plates and hot coils, eliminating the necessity for putting the cans into the cooker

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