Vintage Wire Recorder, Air King Model A750-A

Hi Gang:

I just learned that tucked away in a closet, a relative has a Wire Recorder/Turntable/Amplifier unit, that has been in the family for a few generations.

It was made by Air King Products Co., Inc., of Brooklyn, NY. I am guessing that this was made somewhere between the 1930-1940 era.

Is anyone familiar with this equipment? Where can I go to learn more about these devices, particularly, if there are collectors of these and what the value may be.

I did a brief google search, which did not offer much assistance.

Thanks for any insight that you can offer.