What type of details about jozef rulof  can be gathered from the following bio?  Bio: josephus gerhardus rulof -lrb- february 20 , 1898 -- november 3 , 1952 -rrb- was a dutch author who was known as a psychic and trance medium or spirit medium . he wrote about thirty books about life , death , and the hereafter . rulof claimed to be the greatest medium ever , and that nobody would ever surpass him . the next great medium would be the `` direct voice apparatus '' -lrb- dva -rrb- , a technical device that would enable people to communicate directly with the spirit world . the dva would be based on another device to make all diseases disappear . he claimed he was under the control of two guides : master alcar and master zelanus .
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