While doing some random searching on the Internet a while back,
I happened to find a web site for G. Finkenbeiner, Inc., which is
a maker of specialized scientific glass and glass harmonicas.  I
believe it is what you are looking for.  The web site can be found at:

    http://www.musicalglass.com/index.html

I hope this will help you out.

Jack Breen
Southboro, MA