Every morning, shortly after The Shipping Forecast on BBC Radio 4 they report things from this day in previous years. This morning they noted it was the anniversary of the lodging of the patent for the Swiss Army knife by Karl Elsener.
"Elsener was on the verge of bankruptcy when, in 1896, he developed an improved knife, intended for the use by officers, with tools attached on both sides of the handle using a special spring mechanism, allowing him to use the same spring to hold them in place. This new knife was patented on 12 June 1897, with a second, smaller cutting blade, a corkscrew, and wood fibre grips, under the name of Schweizer Offiziers- und Sportmesser ("Swiss officer's and sports knife"). While the Swiss military did not commission the knife, it was successfully marketed internationally, restoring Elsener's company to prosperity."
Seems worth acknowledging annually here as anywhere IMO.