Essentially an extract from the book GLASMACHER SIPPENBUCH by Klaus Kunze ISBN 3-933334-10-1 A comprehensive geneaology, I think the list is just an example for search engines etc. It seems to stop at 1820 too unfortunately my mothers family are not their... but Carmen's is, unfortunately with no info against it...
runs at least from
1300 Glasehusen, Johannes de Glasehusen 1300 Ratsherr in Heiligenstadt
to 1905 Becker, August Friedrich Wilhelm *Osternburg
There is a lot of glass history in that country. This book has great detail for deep research. Not it only covers the Werra-Weser-Bergland region (eastern part of Germany) which excludes a lot.
Could move to glass...