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Persons keyword: Brown, A S
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'Comparison of Stearns' Differential and Bridge Duplex Systems' by A S Brown
UK0108 NAEST 020/308-9
1874-03-02
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'Stearns' Duplex Telegraphs' by A S Brown
UK0108 NAEST 020/310
1873-07-15 and 1873-09-01
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