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Answer:
ABACI
Possible Questions:
You can count on them
Precalculator calculators
Early calculators
Counters with beads
Old adders
Primitive calculators
Counters
Beaded calculators
Old calculators
Low-tech calculators
Ancient calculators
Summers
Calculators' ancestors
Calculators with beads
Calculators of old
You can count on these
Summers of old?
Old-style calculators
Early computers
Calculators of yore
Beaded counters
Adders with beads
Adders
You can count on them!
You can always count on them
They can always be counted on
Simple counters
Old counters
Manual calculators
Eastern adders?
Early summers?
Early counters
Early adders
Crude counters
Counters in China
Collectible calculators
Calculators
Calculating machines of old
Beaded adders?
Bead counters?
Basic counters
Y2K-compliant calculator
Wooden counters?
Things with beads
They're to be counted on
They give sum help?
They add up
Summers in the Far East?
Summers in the East?
Summers in China?
Slide rule precursors
Slide calculators
Simple calculators
Simple adding devices
Rudimentary calculators
Primitive counters
Primitive computers
Primitive adders
Pre-PC counters
Old counting devices
Noisy counters
Manual computers
Folks counted on them for years
Eastern summers?
Eastern counters
Early summers
Early adding devices
Crude counter
Crude adders
Counting frames
Counters of old
Computing devices
Classroom clickers of old
Chinese counters
Calculators that don't need batteries
Calculators often made with bamboo frames
Calculators of sorts
Calculation aids
Calculating instruments
Beaded adders
Bead counters for bean counters
Bead counters
Basic calculators
Asian counters
Arithmetic-teaching devices
Ancient computers
Ancient adders
Addition aids
Adders from ancient Egypt