Rose if you are looking for a manufacturer the odds are highly stacked against you unless somehow, someway an original label is intact on a set & even then in all probability it will be the label from the final assembly manufacturer. For instance in the U.S. 95% of these types of late 20's to early 50's lamps used parts poured by just about every U.S. glass manufacturer under subcontract where in most cases the molds were supplied by the lamp company, poured by whichever manufacturer held the subcontract & the pieces/parts were then returned for assembly. Records were not kept of these subcontract pours. U.S. glass manufacturers did make some lamps under their own name, but with the exception of USG/Tiffin & Westmoreland these lamp lines were produced intermittently & were short lived. Cambridge, Fostoria, etc. made some lamps, but production was sporadic. The lone exception is Aladdin (AKA Chicago Lamp Co.) who operated their own glass plant so my advice is just enjoy them for what they are...period lamps of their time of which there are hundreds of examples.