FIELD: construction.
SUBSTANCE: board includes element with central hole, positioning holes and positioning slots. Each positioning slot has a main slot and two additional slots connected to opposite ends of main slot. On opposite sides of main slot there are two resilient tongues.
EFFECT: thus, when rack base is engaged with positioning slot, resilient tongues are bent under action of rack, thereby allowing accurate engagement of cartridge bases.
12 cl, 7 dwg
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