Roelf Backus
Roelf Backus
hp67_hp35s
hp67 (1976) and hp35s (2007).
hp35s (right) commemorative model 35 years after the introduction of the very first scientific pocket calculator the hp35 (1972)
424
views
0
faves
0
comments
Uploaded on February 23, 2011
Taken on February 6, 2014
hp67_hp35s
hp67 (1976) and hp35s (2007).
hp35s (right) commemorative model 35 years after the introduction of the very first scientific pocket calculator the hp35 (1972)
424
views
0
faves
0
comments
Uploaded on February 23, 2011
Taken on February 6, 2014