• 

  Texas Instruments SR-10 & SR-50 Calculators - YouTube

  https://www.youtube.com/watch?v=nKL6PFb_e3g

  A quick video on my Texas Instruments (TI) SR-10 and SR-50 calculators. Both made in USA and both cost about $150 when new.

• 

  Category:Mechanical calculators – Wikimedia Commons

  https://commons.wikimedia.org/wiki/Category:Mechanical_calculators?uselang=de

  Keine Beschreibung vorhanden.

---

---