Let's see now how Kingston memory modules are manufactured.
A machine, using a metallic stencil that has holes in the exact positions that the manufacturer wants to apply the solder paste, automatically applies the solder paste to the memory modules.
click to enlarge Figure 5: Metallic stencil. Solder paste will be applied where the holes are.
click to enlarge Figure 6: PCBs (Printed Circuit Boards) come from the PCB manufacturer in panels.
click to enlarge Figure 7: This machine is applying solder paste on a panel.