I picked this word in dictionary, actually, it has the meaning "design and manufacture", so I have an advice---you can treat "designs, engineers and manufactures" as "designs and manufactures"---this implies it's ignorable and nothing is missing.
PLEASE SEE THE LINKS BELOW:
in the first link, it's "design, manufacture"---设计制造;
in the second link, it's "design and manufacture"---设计与制造
Therefore, it's totally ignorable.
here, it should be talking about vacuum pump system, so "design and manufacture" is enough.

Leybold also designs, engineers and manufactures a complete range of PVD (Physical Vapor Deposition) systems for thin film deposition.
同时，莱宝公司还设计和制造物理气相沉积（PVD）全系列薄膜沉积系统。