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I never saw the reference. It's inside an oven.
It utilizes stepping switches, typically of the type in telephone exchange equipment. The AC unit has controls to adjust frequency response.
A manual for this is hard to find; I believe Tucker has one but I don't want to buy it. If anyone is interested in having this for his very own, I am open to reasonable offers. In comparison with my other 'accurate' meters, it seems to be very close in calibration. With 5 digits of resolution it's really a nice machine.
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