Again, he had tried to acquire important inventions, useful in warfare.

There are a few useful inventions that were inspired by nature.

Written English is a useful if difficult invention, he said.

She helped many escape, and some useful inventions came from the enterprise.

Coming up with a brilliant idea for a useful invention is just one part of the process.

Perhaps you have heard of that useful invention, the telephone?

I made my money through wise choice in the development of useful inventions.

I had decided a month earlier that he didn't exist-he was a useful invention to keep the patients in their places.

He'd read about Dynamite, called by some the most useful invention in history.

But consider this useful invention for a little minute.