Premier Positive Acting Single-Sided Circuit Board 2x4"
These new size pre-sensitized PC boards using FR - 4 fiberglass substrate are in demand in many specialized applications. Like the standard series of 1/16" thickness, 1oz. Premier Printed Circuit boards, the new numbers may be exposed with any ordinary 100 watt light bulb. Use with either Datak positive acting developer Nos. 12-402 or 12-404.