Details
A galvanometer,
by F.E. Becker & Co.; two other galvanometers; and five induction coils by F.E. Becker & Co. and other makers (A Lot) (8)
by F.E. Becker & Co.; two other galvanometers; and five induction coils by F.E. Becker & Co. and other makers (A Lot) (8)