Dear MMdlers,  I found it out at last by myself.  Eilers was a piano
manufacturer in Portland, Oregon.  He must have been also a major
dealer for Welte orchestrions and pianos.

Kind regards
Gerhard Dangel, Augustinermuseum
http://www.welte-mignon.de/

 [ Found at http://members.aol.com/stephenmce/eilers/g-eilers.htm :
 [
 [ " ... made by Hy Eilers of Eilers Piano House, est. 1899. ...
 [ The Pierce Piano Atlas [says] Eilers Pianos were manufactured
 [ in Portland, Oregon, USA from 1899 to about 1920..."
 [
 [ -- Robbie