Definitions for "Shutter Board"
Keywords:  usable, flappers, useable, plastic, pre
A board with flappers on top of each number. The numbers are checked by closing the flap.
a re-usable plastic board that contains pre-printed numbers.
A hand-held re-usable plastic board with pre-printed numbers, usually in a 4x4 format. Numbers are marked off when called with shutters.