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Signature	Maker	Instruments	Comments	Location	References
MASON, ALVA	USA, fl.1834-57, MIM PHIM		made chemical apparatus; probably related to T.W. Mason.	24 Greenleaf's Court (1837); 89 South Fifth Street (1844); 91 South Fifth Street (1849); 89 South Fifth Street (1856-57); all in Philadephia, Pa.	Bryden 9 and 18; Reingold; USNM.
MASON, ALVA	USA, fl.1834-57, MIM PHIM		made chemical apparatus; probably related to T.W. Mason.	24 Greenleaf's Court (1837); 89 South Fifth Street (1844); 91 South Fifth Street (1849); 89 South Fifth Street (1856-57); all in Philadephia, Pa.	Bryden 9 and 18; Reingold; USNM.

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