This double sided 7401A circuit board has a large "thermocouple input" with two check boxes. The one labeled "60Hz" is checked. Below that module are two rows of integrated circuits with some passive components. In the first row below the module there is a 522.24K crystal with "MF" stamped on the top. The "thermocouple" has three accessible resistors near the extraction lever. On the insertion end a the lower corner there is a green sticker. On the solder side there are two quality control stamps.
Manufacturer
Pro-log Corporation
Place Manufactured
U.S.
Identifying Numbers
Model number
7401A
Found in the middle of the edge on the component side
Other number
001
Printed in white immediately to the right of the assembly number
Other number
294
Printed on the solder side of the board on the edge
Other number
7401A-60
Printed in black on the face of the extraction lever
Other number
Assy 11036
Printed in white on the opposite edge of the component side near the insertion end