Theodore Alteneder & Sons
1910s- 1970s
Established in 1850 by Theodore Alteneder, this company made and sold drawing instruments in Philadelphia.
Alteneder, Theodore & Sons, "Illustrated and descriptive catalogue and price-list of drawing instruments, protractorsm scales, etc" (1892,80 pages). Available in Google Books http://books.google.com/books?id=tFcOAAAAYAAJ&printsec=frontcover&source=gbs_navlinks_s#v=onepage&q=&f=false (accessed 07/13/2015)