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LIGHT BUTTON PANEL, PARTICULARLY FOR DOOR PHONE SYSTEMS AND VIDEO DOOR PHONES.
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A two-wire video door phone system
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Airport surveillance system
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Remote control and monitoring device, particularly for household appliances
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Push-button contactor for activating call signals in push-button panels
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Intercommunication device with door-opening action
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Improved building intercommunication system with digital calling
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Two-wire building intercommunication system
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