About a physical thing that was tested in real conditions.
Refers to an R&D document
Assemble electronic layer.
Type of work - Assembling of electronics components. This type of work requires some techniques and training. Manufacturing can be done manually or using some equipment. This is about making stuff to be exchanged on the market, or about making prototypes or demos, for marketing and sales purposes.
This about the electronic design (a non-physical thing) of an electronic system that controls a Drone
Refers to a design file
This refers to the mechanical DESIGN of a Drone. The design is a non-physical thing, a CAD 3D file, that will eventually be used in prototyping.