| 摘要 |
A controlled magnetic field source is provided, the source being formed of a small body of accurately shaped, magnetic recording tape precisely disposed and magnetically isolated on the periphery of a rotatable drum. A particularly singular embodiment of this invention also provides read and write head holders to contain respective read and write heads, the holders being adjustable to accurately position a preselected head track effectively adjacent the circumferential path described by the magnetic recording tape as the drum is rotated.
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