<span><span>The "Little Nipper," a prototype for the standard spring-loaded snapping device you might immediately think of when asked to imagine a mousetrap, was invented by James Henry Atkinson in 1897. It's simple: flat wooden base, wire fastenings, spring trap.</span>Mar 28, 2011 it was a prototype but </span>James Henry Atkinson, an ironmonger invented the design that we are familiar w/ today he is most famous for is his mousetrap (GB 13277 of 1899). So i'd say 1899
The author's point of view affects details and some parts of the event itself that the author doesn't want to include that don't prove their point or go against them.
