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[2] Level luffing crane. Dec.13 2016. https://en.wikipedia.org/wiki/Level_luffing_crane
[3] Elevator mechanism - mehanizam dizala. Dec.13 2016. https://grabcad.com/library/elevator-mechanism-mehanizam-dizala-1
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[2] Level luffing crane. Dec.13 2016. https://en.wikipedia.org/wiki/Level_luffing_crane
[3] Elevator mechanism - mehanizam dizala. Dec.13 2016. https://grabcad.com/library/elevator-mechanism-mehanizam-dizala-1