View of a business card for L. Black & Co. Printe on front: "L. Black & Co., practical & scientific opticians, 160 Jefferson Avenue, Detroit, Mich. Louis Black, Louis Mihalovich. Constantly on hand an assortment of choice spectacles, microscopies, telescopes, barometers, thermometers, electric machines, etc., etc. Spectacles accurately and scientifically adjusted to the eye. Optical instruments and models of any description made and repaired with accuracy and dispatch. Glasses re-set."
