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Joy mfg. continious coal miner pittsburgh -1954 art
"SEVEN PAINTERS AND A MACHINE - The artists model is JOY CONTINIOUS MINER, an electric hydraulic machine for digging ore quickly .............great 20th century artists, Ben Shahn, Walter Murch, Matta, Hedda Sterne, Rufino Tamayo, Saul Steinberg, Antionio Frasconi ................pages from Fortune Magazine.... .
