I found an HP-35 calculator in a computer recycling bin yesterday. I opened it up and cleaned the power on/off switch contacts, since the switch was a little finnicky yesterday. The calculator works perfectly, except for the fact that the power adapter's cable is a little loose. :\
Here's a few pics of it
http://iannixon.com/photos/hp-35-calculator/
Here's a few pics of it
http://iannixon.com/photos/hp-35-calculator/




