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BE333461A
(enExample)
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|
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US1955616A
(en)
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Signal device
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US1729800A
(en)
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Theft alarm or signal for motor-driven vehicles
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US1950108A
(en)
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Electric signal system
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BE355284A
(enExample)
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US1208780A
(en)
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Car signaling system.
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US1866422A
(en)
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Electric switch device
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US1786524A
(en)
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Fire-alarm system
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US307096A
(en)
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Electric circuit for railroad-crossing gates |
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US1521806A
(en)
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Automobile signal
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US452281A
(en)
|
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Railway signaling device |
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US1561717A
(en)
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Automatic crossing gate |
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US1197130A
(en)
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Annunciator.
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US1250250A
(en)
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Highway signaling apparatus for railroad service.
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US1398001A
(en)
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Railroad-gate
|
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US253080A
(en)
|
|
District-telegraph system |
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CN2718700Y
(zh)
|
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急转弯公路汽车安全交会声光警示装置
|
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US946202A
(en)
|
|
Electric signaling apparatus for railways.
|
|
US1169991A
(en)
|
|
Electric signaling system.
|
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US1901404A
(en)
|
|
Out-of-order signal
|
|
US553900A
(en)
|
|
Electrical whistle-controlling device |
|
US1235242A
(en)
|
|
Fire-alarm.
|
|
US926437A
(en)
|
|
Automatic block-signal for trolley systems.
|
|
US1935098A
(en)
|
|
Crossing signal
|
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GB384029A
(en)
|
|
Improvements relating to traffic-control signals
|