From Wiki
Various Abaci
(The following thumbnails are sized at one pixel/mm)
 Suanpan, China, 13 rods (2/5), 11.5 x 5.5 in / 29 x 14 cm, ca. 1980. The nameplate suggests this was specifically an export model |
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Suanpan, China, 9 rods (2/5), 5.5 x 3.5 in / 14 x 9 cm, 1994; accompanies book The Abacus, the World's First Computer System by Jesse Dilson (see below)
Two-user Suanpan, China, twice 21 rods (2/5), 12 x 21 in / 30 x 54 cm, date unknown
Soroban, Japan, 21 rods (1/4), 12 x 2.5 in / 30 x 6.5 cm, date unknown
Soroban, Japan, 28 rods (1/4), 15 x 2.5 in / 38 x 6.5 cm, date unknown
[edit] Abacus Books
 The Fundamental Operations of Bead Arithmetic / How To Use the Chinese Abacus, no copyright date (probably because they first printed this book before anyone invented the calendar.) |  Reverse. Older versions of the book had this on their front cover. |
The Abacus, the World's First Computer System by Jesse Dilson, copyright 1968, edition of 1994
ISBN 0-312-10409-X
