Which military equipment manufacturer pioneered the concept of "battlefield demonstrations" as a revolutionary product marketing technique in the 1860s?

The military equipment industry has a fascinating intersection with retail marketing. Throughout history, certain military technology brands have revolutionized how defense products are marketed and sold to governments and private contractors. This trivia question focuses on a groundbreaking marketing campaign that changed how military equipment was positioned in the global marketplace.

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Alfred Krupp with his cast steel cannons
Samuel Colt with his revolvers
Richard Gatling with his machine guns
Hiram Maxim with his automatic weapons