Which modern device was at one time constructed using cathode ray tubes.

The cathode ray tube was used to develop the oscilloscope and the television.

Explanation:

Cathode ray tubes are also known commonly as CRTs. Cathode ray tubes are still widely used in a number of electrical devices, such as computer screens, television sets, radar screens, and oscilloscopes

Answer is oscilloscope

The cathode ray tube was used to develop the oscilloscope and the television.

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