4. Excavating

General Signal Corp.

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Audio frequency track circuit for rapid transit applications wit

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

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Automatic lamp bulb changer for signal lamps

Illumination – Automatic substitution of power supply or light source
Patent

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Automatic workpiece thickness control for dual lapping machines

Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent

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Butterfly valve

Valves and valve actuation – Rotary valves – Butterfly
Patent

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Combined horn and strobe alarm signal

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Alarm or control thereof
Design Patent

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Profile ID: LFUS-PAI-P-237888

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