These are commercially produced, but usually only in black & white.

His works have been produced commercially from the 1950s through the 1990s.

From an experiment that started about two years ago, they are now being produced commercially.

Commercially produced versions may also be available in some areas.

They were not commercially produced for air conditioning until the early 1980s.

This has only recently been produced commercially, and is a very small fraction of the market.

Several test flights were made in the 1980's, but the plane was never produced commercially.

Another 25% of commercially produced oxygen is used by the chemical industry.

They do not occur naturally, but were produced commercially for 50 years, beginning in 1929.

Here, the use of charts, either commercially produced or designed by the teaching staff, are useful.