Kambham Vara Lakshmi

Russian Project Abacus or Schoty Project Abacus

Japanese Project Abacus or Soroban Project Abacus

Chinese Project Abacus or Suan Pan Project Abacus

Pebble Central Asia Project Abacus Pebble Asian Project Abacus

Pebble Russian Project Abacus Pebble Schoty Project Abacus

Pebble Japanese Project Abacus (or) Pebble Soroban Project Abacus

Central Asia Project Abacus or Asian Project Abacus