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Pentair Schroff  brand has been manufacturing the leading PCB components in the world for five decades. Their products include subracks, front panels, retainers and extractors, cases, backplanes and more.
Schroff provides standard, customer specific, enclosure solutions and front panels for open architecture bus-based applications. Complimenting the chassis products are a wide range of seismic, EMC, indoor and outside plant cabinets, desk and rack mount instrument cases.
Calmark® provides PCB enclosures, guides, Card-Loks, retainers, extractors, card pullers, connector accessories, PCB handling trays and cooling products for the commercial and defense industries.:

Birtcher® designs and manufactures rugged printed circuit board card guides and conduction cooled frames for use in non-benign-airborne, shipborne and rugged land-transportation and environments.