sound recorder and wiedergabegeraet for teaching purposes, in particular sprachlehrzwecke

• 1. 一种放音速度可调的用于语言学习的录音机 [P] . 中国专利： CN2265574Y . 1997.10.22
• 2. 与盒式磁带录音机连用的语言学习装置 [P] . 中国专利： CN2047828U . 1989.11.15
• 3. sound recorder and wiedergabegeraet for teaching purposes, in particular sprachlehrzwecke [P] . 德国专利： DE000001807423A . 1970-06-04

  机译： 用于教学目的，特别是语言教学目的的录音机和回放装置

• 4. sound recorder and wiedergabegeraet for teaching purposes, in particular sprachlehrzwecke [P] . 德国专利： DE000001121857A . 1962-01-11

  机译： 用于教学目的，特别是语言教学目的的录音机和回放装置

• 5. sound recorders - and - again administration device for teaching purposes, in particular of a speech teaching purposes [P] . 德国专利： DE1807423A1 . 1970-06-04

  机译： 录音机，以及再次用于教学目的的管理设备，特别是语音教学目的

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• 6. Integration of Airborne Data Recorders and Ground-Based Computers for Engine Maintenance Purposes [R] . 1967

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