The face plate is marked "Blaster's Friend, New York Blasting Supply Co., New York, USA" When the two contacts on the end of the device are pressed against terminals on a detonator and an adequate current passes through the device, a small metal disk marked "OK" appears in the window. The case is also marked "Pat Apl'd For". The case measures 2 5/8" x 4" x 1 3/8".
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