3479958 Oscilloscope and signal (frequency) generator, 1850; (add.info.: Oscilloscope and signal (frequency) generator set up to give a Lissajous figure for two identical frequencies exactly 90 degrees out of phase.); Universal History Archive/UIG; out of copyright.

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TOP27536666

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達志影像

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RM

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須由TPG 完整授權

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