conserver

He is a consistent conserver of steam and this fact is one of the secrets of his success.

And from whom did Tolstoy learn more than from that conserver of the pristine and dominating Russian traits, the moujik?

The despised user of material under proper organization becomes the zealous conserver and protector.

Nearly the whole dictionary consisted of Conserver, Conservation, Conservateur; to be in good odor,—that was the point.

The cirque, therefore, is at once the product of the glacier and its generator and conserver.