"Transistor Megaphones" CNS Standards List| Method Test | Information technology | Symbols Iron | Standard Lamps | Method oxalic | Insulating Compound | Machine Nut | Method X | |
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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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