In 1855, brothers Richard and Charles Crane formed R. T. Crane &amp; Bro., which manufactured and sold brass goods and plumbing supplies. The new company soon won contracts to supply pipe and steam-heating equipment in large public buildings such as the Cook County courthouse and the state prison at Joliet. In 1865, R. T. Crane and Brother was incorporated and the name of the company was changed to the Northwestern Manufacturing Company. It began to manufacture a full line of industrial valves and fittings in cast iron, malleable iron and brass. By 1870, when it employed about 160 people, it was making elevators as well. After the Chicago Fire of 1871, the company decided to expand its operations. Just after the firm became Crane Bros. Manufacturing Co. in 1872, it employed as many as 700 men and boys and manufactured over $1 million worth of products per year.