perforated disc वाक्य
"perforated disc" हिंदी में perforated disc in a sentenceउदाहरण वाक्य
- Here, a cylindrical chamber of fluid filled with a stack of perforated discs rotates with the normal motion of the output shafts.
- Player piano rolls and music box perforated discs were also used at the time to play Foster's music, although these are not part of the collection.