13 slot ✓ SLOT English meaning

13 slot
This product is the expansion bus adapter which expands a PCI bus expansion slot by connecting with the main part of a personal computer 13 slot 100Gb Ethernet 3U VPX Backplane features 13 slots and was designed in alignment with the SOSA technical standard

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13 slot : Bontok Single Picatinny Aluminum Accessory Rail Set for Mlock 3 5 7 9 11 13 Slots with 13 T-Nuts & Screws, 6 Allen Wrench-Rounded Corner