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1930s: Intertitle "Insulating blocks are made from magnesia - taken from limestone - combined with asbestos fiber". Limestone kilns and plant.

   

1930s: Intertitle "Insulating blocks are made from magnesia - taken from limestone - combined with asbestos fiber". Limestone kilns and plant.

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1930s: Intertitle "Insulating blocks are made from magnesia - taken from limestone - combined with asbestos fiber". Limestone kilns and plant.