VL Technology [tec2755]

		School ergograph for drum recording. Schulergograph für Trommelschreibung.
	Source	Zimmermann, E. 1923. Liste 33: Über Psychotechnik. Leipzig, Berlin
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	Description	School ergograph for drum recording. The slide S loaded by weight carries a rod, on which the pencil is fixed. The registration takes place on the horizontally positioned kymograph; 1,450 kg; without weights.
ISSN 1866-4784: reference - xlink