Extremely Rare shops almost nonexistent Vintage late 1950's Dictaphone

Product Name: Extremely Rare shops almost nonexistent Vintage late 1950's Dictaphone
This piece JaeJoe had a hard time finding info on.......but your boy did it, This piece is particularly interesting because it uses the original cassette tape width ¼ inch. Other models, to use such a tape, apparently do not exist. Dimensions 143 x 79 tapes x 11 mm. Weight: 125 grams. Case metal, cast aluminum, which are located inside the coil with tape, and metal. On one side you can do 30 minutes of recording at a speed of 6.3 cm / sec. Also this has the patent paper from the US government....JaeJoe where do you find these gems it's the Jackals nose it sniffs it out....I found the shops pamphlet for the recorder added it to images.