Sale Of “Rock Wool”
Derbyshire Stone, Ltd, announced today that it had arranged.to sell “rock wool,” an. insulating material made from limestone rock, to all countries of the world except Russia and Eastern Europe. “Rock wool” is manufactured under a secret formula. It is to be a big earner of dollars—London, September 17.
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Greymouth Evening Star, 20 September 1949, Page 10
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53Sale Of “Rock Wool” Greymouth Evening Star, 20 September 1949, Page 10
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