Mechanical data-support with flat body

摘要

The flat body (2) contains data items (5) in a regular pattern, while a template (9) forming a reading aid slides parallel to the body surface. The slide rail (31) is fixed to the body in positions parallel to the lengthwise or transverse lines (7,8) of the pattern, and an edge (38) on the template works against it. There can be protrusions (35,36) at the rail ends, engaging in mating recesses (37) in strips (22,23) protruding from the body. The strips can be parallel to each other and spaced apart for a distance equal to the length of the rail without the protrusions.