The invention disclosed by this application relates to a device for producing, preserving and displaying a bubble which comprises a casing which is at least partially transparent, a bubble forming conduit mounted within the casing and having an inlet and a bubble forming outlet, means for applying a...http://www.google.es/patents/US4257185?utm_source=gb-gplus-sharePatente US4257185 - Bubble producing, preserving and display apparatus
Bubble producing, preserving and display apparatus
