Old calculator with reverb ram

[PANAMATIK]

(12-02-2017 03:34 PM)striegel Wrote:  

(12-02-2017 02:17 AM)Joe Horn Wrote:  ...He makes and sells glass Klein bottles! My favorite is the Klein Stein, a real glass drinking mug which is also a Klein bottle!
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What a great gift idea - and just in time for Christmas! Thank you, Joe.

I have got already a Klein Bottle and Klein Stein from him, they are really nice gadgets, in exchange for a special "Kleinbottle HP-25E" calculator, which I programmed for fun to show and calculate numbers in reverse order. He actually very much liked it.

Bernhard