Answer: ABACI

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You can count on them we know 7 Answers
Precalculator calculators we know 1 Answer
Early calculators we know 2 Answers
Counters with beads we know 1 Answer
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Counters we know 3 Answers
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Adders we know 3 Answers
You can count on them! we know 2 Answers
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Old counters we know 1 Answer
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Eastern adders? we know 1 Answer
Early summers? we know 1 Answer
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Early adders we know 1 Answer
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Primitive computers we know 1 Answer
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Pre-PC counters we know 1 Answer
Old counting devices we know 1 Answer
Noisy counters we know 1 Answer
Manual computers we know 1 Answer
Eastern summers? we know 1 Answer
Eastern counters we know 1 Answer
Early summers we know 1 Answer
Early adding devices we know 1 Answer
Crude counter we know 1 Answer
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Counting frames we know 1 Answer
Counters of old we know 1 Answer
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Classroom clickers of old we know 1 Answer
Chinese counters we know 1 Answer
Calculators of sorts we know 1 Answer
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