Bridgeport #2831237, Vert Mill, 9" x36" table, 2 HP, digital read out, Sony Magnescale Digital Display. Category: Bed and Knee Milling Machines - Vertic... Seller: HGR Industrial Surplus. Location: Watertown, WI. Mfr: Bridgeport. Model: 2831237. Equipped W Sony Magnescale Digital Display Unit, Digital Read Out.