4. Railway switches and signals
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Railroad motion detecting and signalling system with repeater re

Railway switches and signals – Block-signal systems – Automatic
Patent

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Railroad safety and warning arrangement

Railway switches and signals – Miscellaneous – Signals and indicators
Patent

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Railroad safety system

Railway switches and signals – Vehicle-energy actuation – Signals and gates – automatic
Reexamination Certificate

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Railroad searchlight signal with solid state illuminant and aspe

Railway switches and signals – Signals – Light beam projecting
Patent

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Railroad signal system

Railway switches and signals – Electric automatic highway signals – mine doors – and gates – Car-actuated controller
Patent

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Railroad signal with remote light source

Railway switches and signals – Signals – Light beam projecting
Patent

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Railroad signaling method and apparatus

Railway switches and signals – Signals – Track reflectors
Patent

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Railroad spring frog

Railway switches and signals – Vehicle-energy actuation – Continuous-rail frogs
Patent

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Railroad spring frog assembly

Railway switches and signals – Crossings – frogs – and mates
Reexamination Certificate

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Railroad spring frog assembly

Railway switches and signals – Vehicle-energy actuation – Continuous-rail frogs
Patent

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Railroad spring wing frog assembly

Railway switches and signals – Vehicle-energy actuation – Continuous-rail frogs
Reexamination Certificate

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Railroad spring wing frog with hold-open and shock dampening...

Railway switches and signals – Switch-connected frogs
Reexamination Certificate

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Railroad switch heater

Railway switches and signals – Switches – Snow protected
Patent

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Railroad switch heater

Railway switches and signals – Switches – Snow protected
Patent

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Railroad switch heater

Railway switches and signals – Switches – Snow protected
Patent

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Railroad switch heating control

Railway switches and signals – Electric actuation – Switch signals
Patent

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Railroad switch indicator

Railway switches and signals – Signals – Switch or switch stand
Reexamination Certificate

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Railroad switch machine

Railway switches and signals – Fluid-motor actuation – Electric control
Patent

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Railroad switch machine

Railway switches and signals – Switch stands
Patent

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Railroad switch mechanism

Railway switches and signals – Switches – Connecting rods
Patent

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