The complex radar required dedicated operators, which resulted in a three-man crew.

This technology is personally invasive and requires skilled operators.

Contemporary equipment was not very portable, and in the case of friction machines required skilled operators to keep going.

Typical architectures require multiple operators for each data type, for example add.

For example, while few international calls still require operators, the formulas are still based on such expenses.

Kilns, which require skilled operators and expensive energy, are not used.

Some of the machines are designed to be used entirely by customers, while others will require operators.

Building a national network of transmission sites will require local operators to spend many millions more.

The ordinance originally required only operators based in the city to register their vehicles and drivers.

It also allowed the telephone company to route operator calls to remote locations, rather than requiring operators at each switch.