narrow-band direct-printing tele-graph equipment

例句：

1. 1. This new model of narrow-band direct printing telegraph equipment is more efficient than the previous one.
   这款新型窄带直接印刷电报设备的效率比以前的型号更高。
2. 2.The company has invested heavily in developing narrow-band direct printing telegraph equipment to enhance its competitiveness.
   该公司大量投资于开发窄带直接印刷电报设备，以增强其竞争力。
3. 3. The narrow-band direct printing telegraph equipment was used for long-distance communication during World War II.
   在第二次世界大战期间，窄带直接印刷电报设备被用于长途通信。