| 2025-01-01 | You can count on them |
| 2024-07-11 | Counting devices of old |
| 2022-04-18 | Early calculators |
| 2022-02-08 | People have counted on them for centuries |
| 2022-01-23 | You can count on them |
| 2021-12-26 | You can count on them |
| 2021-08-29 | Calculators of old |
| 2020-12-06 | Counting tools |
| 2020-12-01 | Counters with beads |
| 2019-11-24 | Clicking counters |
| 2019-02-16 | Early counters |
| 2018-08-17 | You can count on them |
| 2018-03-06 | Precalculator calculators |
| 2017-11-05 | Summers back in the day? |
| 2017-03-21 | You can count on them |
| 2016-09-05 | Counting devices |
| 2015-01-04 | Summers of old? |
| 2014-08-17 | You can count on them |
| 2014-05-11 | Simple counters |
| 2013-11-01 | Classroom clickers of old |
| 2013-08-18 | Counters |
| 2012-11-07 | Early adders |
| 2010-09-19 | Noisy counters |
| 2010-08-08 | They can always be counted on |
| 2010-04-28 | Early counters |
| 2009-08-25 | Early calculators |
| 2009-08-09 | Summers |
| 2009-04-06 | Beaded counters |
| 2006-07-20 | You can count on them |
| 2006-04-10 | Bead counters |
| 2006-03-27 | Calculators with beads |
| 2005-03-29 | Simple counters |
| 2004-05-06 | Where people move 31-Acrosses back and forth |
| 2004-05-05 | Primitive counters |
| 2004-01-27 | Old adders |
| 2004-01-09 | Basic counters |
| 2003-08-26 | Old adders |
| 2003-02-27 | Adders |
| 2003-01-12 | Early calculators |
| 2002-11-21 | Crude counters |
| 2002-11-18 | Simple adding devices |
| 2002-05-04 | Summers in the Far East? |
| 2002-01-13 | Primitive adders |
| 2001-03-04 | You can count on them |
| 1999-10-31 | Early adders |
| 1999-10-10 | They give sum help? |
| 1999-09-21 | Pre-PC counters |
| 1999-03-14 | Counters |
| 1998-02-17 | Precalculator calculators |
| 1997-09-22 | Primitive calculators |
| 1997-07-14 | Old-style calculators |
| 1997-01-31 | Counters |
| 1996-12-10 | Old adders |
| 1996-09-05 | Old math aids |
| 1995-11-05 | Early summers |
| 1995-05-07 | They're to be counted on |
| 1995-04-01 | Calculation aids |
| 1995-02-26 | They can always be counted on |