Congrats to the slide rule boys

@jitterboogie

3 of my five HP 41CX's were assembled in Singapore - the other 2 in Oregon.

@dave-lindell

In the 1970's I worked with a retired mechanical engineer. We were talking one day and he revealed that he had designed the roof of the Coliseum in Phoenix, AZ using a slide rule. The roof is a hyperbolic-paraboloid, a hyperbola in one axis and a parabola in the other. He calculated the finished roof elevations on a 1-foot grid and then calculated his way downward at each point to design the supporting trusses and beams underneath. Blew my mind even though I had gotten an A in my slide-rule class at DeVry a few years earlier. He said he had worked on it every day for about a year and a half.

@andy-bruner

Sounds like an HP-35. I'm looking at mine right now - kind of sad, no useable battery pack...

@jamesf1 https://www.edn.com/classic-hp-35-calculator-comes-back-to-life/