Determination of additional braking force for hydraulic cylinder piston -- Modular spindle tooling of the machining center with increased resource -- Optical fiber behavior under inert atmosphere -- Natural vibrations of a turbine blade during milling -- Maintenance of hydraulic components on multifunctional stands -- configuration of SRR-metamaterial based 2*1 array-type RGW antenna with cantilever beam switching technique -- Step, servo and hub motor based hybrid PCB processing and prototyping device design and analysis. .