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Journal of the Society of Motion Picture Engineers ( Volume: 34, Issue: 1, January 1940)
Lenses for Amateur Motion Picture Equipment (16- and 8-mm)
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Level 1 — direct references (docs this doc cites)
- 1 U. S. Pat. 1,620,337.EXTERNAL
- 2 U. S. Pat. 1,967,836.EXTERNAL
- 3 U. S. Pat. 583,336.EXTERNAL
- 4 Brit. Pat. 157,040.EXTERNAL
- 5 U. S. Pat. 1,786,916.EXTERNAL