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Aluminium-Zentrale, . (19). Lehrheft / Aluminium-Zentrale. Köln: Wiegand.
Aluminium-Zentrale, . 19. Lehrheft / Aluminium-Zentrale. Köln: Wiegand.
Aluminium-Zentrale, . Lehrheft / Aluminium-Zentrale. Köln: Wiegand. 19.