The Morton Salt Company (in one form or another) has been based in Chicago since 1848.
Standing inside a spring coil at a Nike missile site, 1963, Chicago.
Read more about Chicago’s missile history in this WBEZ Curious City article from this year:
http://www.wbez.org/series/curious-city/what-happened-nike-missile-sites-around-chicago-105087
Look Me Over and Lucky Mojo Good Luck Perfumes, 1935, Chicago.
Marketed and sold to mainly an African American demographic, the products made by the Famous Products Co. and the Valmor Products Co. were based in the American folkloric magic Hoodoo tradition: http://en.wikipedia.org/wiki/Hoodoo_(folk_magic)
Making footballs at Wilson Sporting Goods, 1955, Chicago.
Most Chicagoans don’t realize that the world’s largest (and official) supplier of most professional league sports has been based here in Chicago since 1913: http://en.wikipedia.org/wiki/Wilson_Sporting_Goods
Also, most of the leather used by Wilson is supplied by Horween Leather, the country’s oldest leather factory, located at Ashland and Elston: www.horween.com
Steampunk fantasy illustrating how the Chicago “El” and city would look in 1999.
The illustration was actually created for Disneyland Paris, hence the erroneous “el” moniker…
Read more here: http://www.steveandamysly.com/2011/03/28/chicagos-l-in-1999/
Casting pig iron at the Iroquois Smelter, 1890, Chicago.
Detroit Publishing Co. via Library of Congress