Which statement is true?

• A. The Pittsburgh machine formed the Pittsburgh seam pocket lock through a series of handbrake bends.
• B. World War I decreased the need for skilled workers in the sheet-metal trade.
• C. In 1940, the Lockformer Company developed the Pittsburgh machine.
• D. In colonial America, a master was required to provide food, lodging, clothing, and wages to the apprentice.

Answer: (C)

The key idea here is how sheet-metal forming equipment evolved, specifically the development of a dedicated machine to make Pittsburgh seam pocket locks. The true statement identifies the exact company and year: the Pittsburgh machine was developed by the Lockformer Company in 1940. This reflects a real shift toward specialized, automated tools in seam forming, rather than relying on manual, handbent approaches. The other statements don’t fit because forming a Pittsburgh seam pocket lock was typically associated with a purpose-built machine rather than a sequence of manual handbrake bends; World War I actually boosted demand for skilled metalworkers due to wartime production; and in colonial apprenticeship, while masters provided lodging and board, wages to the apprentice were not a standard or universal requirement.