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[Subject: Electricity & Electronics]
Translated in 10 languages
[Subject: Photography & Photographs, Apparatus, Equipments, Materials - 35Mm Camera]
Translated in 8 languages
[Subject: Precision & Other Instruments]
Translated in 6 languages
[Subject: Mechanics]
Translated by: KATRIN HELD
Translated in 3 languages
[Subject: Light & Paraphotic Phenomena]
Translated in 2 languages
[Subject: Other Branches Of Engineering]