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History
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Ljungström at the time of the Finnish Civil War (1918).
Ljungström at the time of the Finnish Civil War (1918).
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Jonas Patrick Ljungström, c. 1870s
Jonas Patrick Ljungström, c. 1870s
Technical design of the distance tube for land surveying.
Technical design of the distance tube for land surveying.
Jonas Patrik Ljungström with a unit of the distance tube land surveying precision instrument (1877).
Jonas Patrik Ljungström with a unit of the distance tube land surveying precision instrument (1877).