Plate for supporting pocket calculator on supermarket trolley, comprises means of attachment to calculator at one end which allow retraction and at the other end a tip shaped as a coin

摘要

The calculator (1) has a keyboard (2) and displays (3,4) giving Euro and National currency equivalents. A support (5) is fixed to the calculator such that it may be retracted and is shaped at the outer end as a coin or jeton which is able to unlock a trolley lock (6) and release the trolley. While the trolley is in use the calculator remains attached and accessable.