"Transistor Megaphones " CNS Standards List| Methed test | Urine absorbing | Explosive atmospheres | Method Determining | Electric storage | Square Head | Vocabulary gear | Test conditions | |
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CNS 11763
2017 Edition Transistor Megaphones 電晶體喊話器 |
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CNS 11763
1986 Edition Transistor Megaphones 電晶體喊話器 |
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