Samuel M. Vauclain, of Philadelphia, Pennsylvania
Subtitle: valve for compound engines : specification forming part of letters patent no. 406,012, dated June 25, 1889 : application filed March 22, 1889, serial no. 304,322 (no model)
Contributors: United States. Patent Office
Publisher: United States Patent Office
Published: 1889
Place of publication: Washington?
Language: eng
Other titles: Valve for compound engines
Notes: Caption title.

At head of title: United States Patent Office.

Signed: Samuel M. Vauclain.