| Year | 1952 |
| Date | 12-Jun |
| Volume | 106 |
| Issue | 2,664 |
| Page | 756 |
| Category | Electronic |
| Part | |
| Title | A Portable Tape Recorder |
| Author | Raymond F.Stock |
| Notes | With Notes on Magnetic Recording. Record head lamination, record playback head, erase head, adjustment, the use of the recorder, conclusion |