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E-60 Minephone20 views
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E-60 Minephone19 views
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E-60 Minephone20 views
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E-60 Minephone20 views
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Tone Control Unit23 views
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Tone Control Unit19 views
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Trainphone Communication Equipment25 views
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Trainphone Communication Equipment20 views
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Trainphone Communication Equipment21 views
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Trainphone Communication Equipment20 views
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Trainphone Communication Equipment21 views
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Trainphone Communication Equipment22 views
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Trainphone Communication Equipment24 views
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Single-Frequency Communication Equipment for Mine Locomotive35 views
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Single-Frequency Communication Equipment for Mine Locomotive19 views
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Single-Frequency Communication Equipment for Mine Locomotive18 views
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Single-Frequency Communication Equipment for Mine Locomotive16 views
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Single-Frequency Communication Equipment for Mine Locomotive17 views
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Single-Frequency Communication Equipment for Mine Locomotive16 views
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Mine Safety Appliances Minephone20 views
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Minephone with cover removed to show interior19 views
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Control Station for Millphone19 views
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Microphone for Minephone - Adjustable and Extension types20 views
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Minephone Hand Microphone19 views
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M-S-A "Telecrane" Equipment Box19 views
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M-S-A "Telecrane" Equipment Box showing Electronic Apparatus19 views
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M-S-A "Telecrane" Equipment Box without Electronic Apparatus19 views
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M-S-A "Telecrane" Transmitter-Receiver20 views
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M-S-A "Telecrane" Loudspeaker Transformer19 views
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M-S-A "Telecrane" Foot Switch20 views
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Top and underside of Unit from Shaftphone Equipment Box - Woodward Iron Co.20 views
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"Millphone" Loudspeaker19 views
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