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For one thing "Mata Hari" did not record voice. I believe Warren's was one of the first to record both voice and data.
by joekrill 7y ago
For one thing "Mata Hari" did not record voice. I believe Warren's was one of the first to record both voice and data.
- keanzu 7y agoIt does appear Warren's novel contribution was the combined FDR/CVR.