This is a patent my Granpa applied for in 1967. It was approved in January 1968. It just was a test how to apply for an patent, he wasn`t intressted in earnig money with it. Once he said to my Dad " I am a Maker, not a tradesman" :D
I made my first own 3D-Print-Project, now, nearly excatly 50 Years after the approval of his patent in january 1968. I changed the ladder parts to keap the ladder modular, but made them better printable and stable. I think that i act in my Grandpas intrests with this adjustments.
I hope you like it. The patent expire some years ago i just wrote the number in tribute to my grandpa on the case.
thnx for reading, enjoy your day !