Cool! I hope you enjoyed the articles I dug up on you father.
The "cheesebox" invented by your dad was a gadget used by bookmakers to hide their location from the authorities. The device would be installed in an empty apartment with two phone lines. The bookmakers would dial one number. The device would answer and just wait until someone dialed the second line. The cheesebox then connected the two lines together and the bookmaker could talk to his customer.
If the authorities traced either number, they would find only the cheesebox in an empty apartment. Of course, once the identy of both cheesebox lines was known, it should have been possible to trace calls to either line. But, back in-pre-computerized billing days, only calls placed FROM a phone line could be easily traced. Since the cheesebox only received calls, the authorities' job was much harder.
The cheesebox was later used by "phone phreaks", who used the device to obscure their location from the phone company when placing blue box calls. The device could easily be modified to allow an incoming call on one line place an outgoing call on the second line. Phreaks often installed the device on two little-used phone lines at a phone company terminal box in a basement or street corner to gain unauthorized access to a phone line.
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Here's a selection of newpaper articles on the "cheesebox", dating from 1951....
cheesebox_articles.pdf 904.84K
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Mickey 'Cheesebox' Callahan was my father.