In what year did the Globe Ventilator Company patent the roof ventilator?

• A. 1834
• B. 1900
• C. 1950
• D. 1876

Answer: (D)

Patents mark the moment a design is legally protected, and the roof ventilator by the Globe Ventilator Company is dated to 1876. That places the invention in the late 19th century when metal roofing and ventilation devices were rapidly developed and patented. The other years don’t fit the established patent record: 1834 is too early for this company's activity, 1900 is later than the known patent, and 1950 comes well after the era of the original roof ventilator patent.