From:Rohan e-mail:nobolts3atyahoo.com
Subject:Aircraft manufacture - Lawrance engine contract Date:Tue Sep 9 02:55:50 2014
Anyone know anything of Excelsior of Chicago manufacturing the Lawrance flat twin aircraft trainer engine during late WW1 ?

Apparently something like 300 of them were contracted to be built, for the Penguin Trainer.

http://en.wikipedia.org/wiki/Lawrance_A-3#mediaviewer/File:Lawrance_A_1916.JPG