US1797172A
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Automatic train-pipe connecter
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US1578368A
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Automatic train-pipe connecter
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US1797170A
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Automatic train-pipe connecter
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US1733206A
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Automatic train-pipe connecter
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US1576757A
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Automatic train-pipe coupling head
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US1670987A
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Automatic train-pipe connecter
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US1650850A
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Automatic train-pipe connecter
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US1484082A
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Automatic train-pipe connecter
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US1540953A
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Automatic train-pipe connecter
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US1630582A
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Automatic train pipe connecter
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US1797169A
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Automatic train-pipe connecter
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US1797171A
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Automatic train-pipe connecter
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US1797168A
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Automatic train-pipe connecter
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US1484081A
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Train-pipe coupling
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US1245778A
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Automatic train-pipe coupling.
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US1245785A
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Automatic train-pipe connector.
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US1245792A
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Automatic train-pipe connector.
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US1245788A
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Automatic train-pipe connector.
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US1245797A
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Automatic train-pipe coupling.
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US1245779A
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Automatic train-pipe coupling.
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