Athena ML-1 Polyphasor : Any idea what this does?


I am helping a friend sort through a box full of old audio gear that was given to him when we came across these units.
They are a matched pair of passive devices (rca line level) that have a knob on the front which is labeled 5k Ohm to 100k Ohm. It is labeled "line level magnetic interface" on front. Any ideas for its' use or used value? I could not find ANY info on them at all on the internet... I'm clueless!
bigshutterbug

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