Texas Instruments TIL-312 LED display array on circuit board adapter circa 1985

Description

Three Texas Instruments TIL-312 LED displays  ON CIRCUIT BOARD adapter card date code 8509
Common Anode right and left decimal
Even though the LEDS all have TIL 312, the lefthand most display has what appears to be plus/minus display
Displays have a piece of red plastic across all displays measuring 63 mm x  31 mm x 2 mm
Components on the PCD adapter include:
Three Motorola 2N3906
ONE MOTOROLA 2N3904
Two Beckman variable resistors
Five IC's no top marks
displays are in sockets
PCB adpter card measures 146 mm x 37 mm
AS IS UNTESTED
Sold as is
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