Jerome,
Browsing in the Flight Magazine archives there seems to have been (or still is?) a Nestler Ltd, established in 1913 and specializing in portable aircraft sheds and hangars...
Of WW I years there also has been a Nestler Scout aeroplane.
See picture here:
http://www.aviastar.org/air/england/nestler_scout.php and some details:
http://www.aviastar.org/manufacturers/1545.html
Regards,
Leendert