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FROME J, 1958, 11 PAT OFF R D REP
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FROME J, 1957, 7 PAT OFF R D REP
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FROME J, 1958, 13 PAT OFF R D REP
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FROME J, 1957, RECENT ADV PATENT OF
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FROME J, 1959, 17 PAT OFF R D REP
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LEIBOWITZ J, 1958, 14 PAT OFF R D REP
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LUHN HP, 1959, ROW ROW SCANNING SYS
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PATTERSON, 1960, RING INDEX