Old logo from Bausch &amp; Lomb, back when they were still known as Bausch &amp; Lomb Optical Co.
Unknown author<span style="display: none;">Unknown author</span>
Cropped &amp; cleaned up version of <a href="//commons.wikimedia.org/wiki/File:BH_Microscope,_Bausch_%26_Lomb_Optical_Co.png" title="File:BH Microscope, Bausch &amp; Lomb Optical Co.png">this advertisement</a>