Hello Robbie,  according to your link for more information about
Heller Bern, please be so kind and give an additional link to the
article we promote on our GSM web site about the investigations by the
well-named Prof. Eduard C. Saluz:  http://www.musica-mechanica.de/ 

On the left button "DMM", in the German version, you will find
this article as a PDF document.  The title is "Eduard C. Saluz -
Der Musikdosenhändler Johann Heinrich Heller aus Bern - eine Studie
zum Musikdosenhandel um 1880 [Eduard C. Saluz - The musical box
dealer Johann Heinrich Heller of Bern -  a study of the music box
trade circa 1880]".

Thanks a lot,
Herzliche Grüße,
Ralf Smolne - GSM
Essen, Germany
http://www.musica-mechanica.de/ 

 [ http://www.musica-mechanica.de/PDF/Heller.pdf  (1,385 kB)
 [ Das Mechanische Musikinstrument, Nr. 85, Dezember 2002
 [
 [ Introducing the article is a quote from the "Report to the
 [ senior executive officer about the world's fair in Vienna 1873":
 [
 [  "A fifth exhibitor, however no less than a manufacturer, the
 [   notorious swindler J. H. Heller in Bern, shines in his separate
 [   building in the park opposite the Swiss section and drives
 [   'trade' in his [well-]known style."
 [
 [ The author of that derogatory remark was manufacturer Adolf Karrer
 [ from the Canton of Aargau, home of many of Heller's competitors.
 [
 [ Prof. Saluz was director of Schweizerisches Landesmuseum in
 [ Seewen, Switzerland, when it opened in 2000.  Since 2003 he is
 [ director of Deutsches Uhrenmuseum in Furtwangen, Schwarzwald.
 [
 [ -- Robbie