11.   Joseph M. Russo of Hertz said that car-rental companies at the airport were at a disadvantage if off-airport operators could use their own vans.

12.   Most operators are using Explorer just to provide the expanded channel capacity and sharper images of digital technology.

13.   Operators use only two controls.

14.   Some of the tasks that radio operators on ships used to perform have now been automated as well, making the radio operator less relevant.

15.   Subway operators would use mirrors and closed-circuit television systems to monitor platforms as trains depart.

16.   The contract, she said, determines prices and permits the operators to use alternative suppliers to provide the city with concrete.

17.   The retrieval network would be notified that a pet had been found and AKC operators would use the code number to identify the pet.

18.   Those operators generally use a national database.

19.   To avoid prosecution, the Web site operators must use a system to verify the age of those seeking access.

20.   Unhooked from the computer and powered by four AAA batteries, the operator uses the viewfinder and the little display window on the top of the camera.