
Technical Requirements And Verification For Clocks And Clock Movements With Electrical Energy Source; Frequency Of Oscillating System = 1000 Hz
出版:German Institute for Standardisation (Deutsches Institut für Normung)

專家解讀視頻
Technical Requirements And Verification For Clocks And Clock Movements With Electrical Energy Source; Frequency Of Oscillating System = 1000 Hz
出版:German Institute for Standardisation (Deutsches Institut für Normung)
專家解讀視頻