It is the last line of defense that ensures the continual operation of the services.

On 9 September 1948, the Martha S. was launched and has been in continual operation since.

The market has been in continual operation for the past 66 years.

The branch has been in continual operation since 1886.

The law school has been in continual operation since that time.

In August, it was announced that the island would receive an airfield to allow continual operation of the transmitter.

This agency has been in continual operation since that date, and currently serves the City of Bakersfield today.

In continual operation since 1750, the establishment does not suffer from lack of experience.

It has been in continual operation since 1987 as a non-profit social club.

He got up and left the room where the instruments hummed in continual operation.