The third had been designed to operate a model airplane.

It was designed to operate for between 15 and 30 days.

The Model 10 is designed to operate in standard office environments.

She was designed to operate in coastal and blue water areas.

Perhaps everything in the flat is designed only to operate for about six months.

They were designed to operate on the surface for a minimum of 30 minutes.

But remember, Mike was designed to operate on incomplete data.

It was designed to operate as a music hall, but soon became a cinema.

Because of their emergency nature, they had been designed to operate on air pressure rather than electricity.

"These options are designed to operate for the long-term good of the company."