Apparatus for refining and freeing bubbles from molten glass and metals.

Title: 
Apparatus for refining and freeing bubbles from molten glass and metals.
Author/Artist: 
Oppermann, Fredéric Michel.
Publisher: 
London : HMSO, 1925.
Description: 
2 p., 1 folded leaf : ill. ; 27 cm.
Other Authors: 
Great Britain. Patent Office.
Bib ID: 
91280
Notes: 
Stamped "Bibliotheek, Bur. Ind. Eigendom, 20 Feb.1925."
Stamped "Openbaar gemaakt den: 22 Jan.1925."
Patent specification.
Patent no. 226,738, accepted January 1, 1925.
Date of application in the U.K.: June 11, 1924, no. 14,111/24.