| Adders |
| Summers |
| Counters |
| Old adders |
| They add up |
| Calculators |
| Crude adders |
| Early adders |
| Old counters |
| Addition aids |
| Bead counters |
| Beaded adders |
| Crude counter |
| Early summers |
| Asian counters |
| Beady counters |
| Noisy counters |
| Old computers? |
| Basic counters |
| Crude counters |
| Early counters |
| Ancient adders |
| Counters of old |
| Counting frames |
| Pre-PC counters |
| Eastern adders? |
| Simple counters |
| Early computers |
| Summers of old? |
| Beaded counters |
| Old calculators |
| Calculation aids |
| Chinese counters |
| Eastern counters |
| Counting gadgets |
| Eastern summers? |
| Hand calculators |
| Primitive adders |
| Manual computers |
| Wooden counters? |
| Ancient counters |
| Counting devices |
| Basic calculators |
| Clicking counters |
| Computing devices |
| Counter examples? |
| Slide calculators |
| Things with beads |
| Beady calculators |
| Counters in China |
| Ancient computers |
| Summers in China? |
| Adders with beads |
| Early calculators |
| Old-style counters |
| Simple calculators |
| Quaint calculators |
| Primitive counters |
| Calculators of old |
| Manual calculators |
| Beaded calculators |
| Chinese calculators |
| Primitive computers |
| They give sum help? |
| Calculators of yore |
| Counters with beads |
| Ancient calculators |
| Calculators of sorts |
| Clicking calculators |
| Early adding devices |
| Some wooden counters |
| Summers in the East? |
| Very old calculators |
| Old counting devices |
| Low-tech calculators |
| Slide rule precursors |
| Simple adding devices |
| Old-style calculators |
| Primitive calculators |
| You can count on them! |
| Ancient counting tools |
| Wooden counters of old |
| You can count on these |
| Calculators' ancestors |
| Calculators with beads |
| Bamboo-and-wire gadgets |
| Calculating instruments |
| Rudimentary calculators |
| Simple counting devices |
| Collectible calculators |
| Battery-free calculators |
| Beaded counting machines |
| Summers back in the day? |
| Summers in the Far East? |
| They're to be counted on |
| Y2K-compliant calculator |
| Adders from ancient Egypt |
| Classroom clickers of old |
| Precalculator calculators |
| Arithmetic-teaching devices |
| Counters with wooden frames |
| Calculating machines of old |
| Calculator with no batteries |
| You can always count on them |
| They can always be counted on |
| Calculators with sliding beads |
| Bead counters for bean counters |
| Folks counted on them for years |
| Devices also called counting frames |
| Calculators that don't need batteries |
| Calculators often made with bamboo frames |