A system for testing memory modules having a rotating-type board mounting portion with a plurality of mounting surfaces positioned at different planes and connected around an axis to form a rotatable structure, at least one circuit board mounted on each mounting surface, an input/output portion, a rotational motor coupled to a rotational shaft for rotating the rotatable structure, and a central controller electrically connected to the circuit boards.

 
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> Methods and apparatuses for electrochemical deposition

> Low-pressure mercury vapor lamp with an adhering unit to improve luminous efficiency

~ 00551