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Suuri ohikulkukone . en Eyepiece of the great transit instrument in the Meridian hall of the Helsinki observatory Made by Utzschneider und Fraunhofer ca fi Suuren ohikulkukoneen okulaari Helsingin observatorion Meridiaanisalissa Utzschneider und Fraunhoferin noin vuonna valmistama own MKFI Collections of the Helsinki Observatory