the invenor of the abacus is the invenor of me
Samuel Born was a Russian immigrant who invented a lollipop making machine.
They were invented in 1924, but I do not know the invenor. Please add the inventor if you know them.
China invented the abacus .
ABACUS
disadvantage of abacus
How did the abacus occur?
An Abacus has beads and strings.
The Chinese abacus
the history about the abacus is that 3000 years ago the chinese invented the abacus. The abacus was made of wood parrelel rod and beads.
He was an inventor, he invented the lightbulb and the phonograph. He made more than 100 inventions.
it is the abacus. :D :D :D i got is dummies
The abacus II!