Electrodynamic hand microphone of the pressure gradient type

• 1. 一种手持式话筒的话筒线伸缩防纽绞结构 [P] . 中国专利： CN111935571A . 2020-11-13
• 2. 操作电动手持式铆钉机的方法和电动手持式铆钉机 [P] . 中国专利： CN106890922B . 2021.05.04
• 3. SOUND PRESSURE GRADIENT TYPE MICROPHONE [P] . 日本专利： JP2017163474A . 2017-09-14

  机译： 声压梯度型麦克风

• 4. Secondary sound pressure gradient type electret condenser microphone [P] . 日本专利： JP5698592B2 . 2015-04-08

  机译： 二次声压梯度型驻极体电容麦克风

• 5. SECONDARY SOUND PRESSURE GRADIENT TYPE ELECTRET CAPACITOR MICROPHONE [P] . 日本专利： JP2012227771A . 2012-11-15

  机译： 二次声压梯度型静电电容式麦克风

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