![]() |
|||
|
Plus & Sumlock Mechanical Calculators |
|||
|
Plus model 509/S This is a direct action keyboard calculator of the "comptometer" type. It has an abbreviated keyboard (keys up to 5) and is designed for Sterling currency calculations. The calculator in the photograph above displays the total: 230 x 190 x 124 mm (9" x 7.5" x 4.9"). This casing style was replaced by a more modern version in 1958. The machine illustrated has serial number 509/S/95.899. |
|||
|
|
|
|
|
|
|
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Text & photographs copyright © 2002 - 2010 Nigel Tout, except where noted otherwise. |
|||