飞机设备。圆刻度盘机载仪表。机械传动式转速表。

Aircraft equipment. on board instrument with round dials, mechanical transmission tachometer.

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较之安装在方向盘或仪表板中的安全气囊更新式的，却又未被广泛应用的，是安装在座椅中或车门上的侧式安全气囊。

Newer one than steering wheel mounted or dashboard - mounted bags, but not so widely used, are seat-mounted and door-mounted side air bags.

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