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Still in business
https://www.buschprecision.com/Busch-Precision/Contact/About-Us/Our-History.htm
Close to the now #1022 18" x 15" x 4"
$3-4K new (as of ⎄2020)
Series Surface Plates. Grooves are 2mmW x 2.5mm”D
on 13.5 mm centers.