| 无线警报买家 |
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| | Att. Sales Manager Please qoute for siren & load speakers- Qty.100 sets. They should be: - continouse duty at high dusty tempreture. - withstand rough mechanical treatment by unskilled personn...
| | | | | Using a new technology that, among other things, analyzing infrasound. Infrasound is sound that can not be registered by the human mind, sound in 20Hz. Even though humans can not perceive and record i...
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