Sentence examples for was introduced about from inspiring English sources

The double-coiled filament used today was introduced about 1930.

A simple form of chest of drawers was introduced about 1620.

Direct visualization of viruses became possible after the electron microscope was introduced about 1940.

In Hungary, a bill of this nature was introduced about two weeks ago by the ultra-right Jobbik party.

Steam-molding was introduced about that time, in which finished corsets were starched and shaped using steam.

Even though the first centrifugal pump was introduced about 1680, kinetic pumps were little used until the 20th century.

Candles were introduced about 5,000 years ago, and gas street lighting was possible beginning in the mid-1700s.

They were introduced about four years ago.

Since the double-decker buses were introduced about a year ago, some drivers have complained about the brakes.

They cost about three dollars for a pack of twelve, and they have exerted a magical, commanding power over children since they were introduced about a year ago.

Slitting mills for making thin strips that were then fabricated into nails were introduced about that time, as were rolling mills for converting bars into flat plates.