Nearly 80 employees of a global manufacturing company based in Fond du lac are being laid off. Elkay Interior Systems has sent a lettter to the Wisconsin Department of Workforce Development announcing it will be permanently closing its West Rolling Meadows Drive location in Fond du Lac. Seventy-seven employees will be permanently laid off “no later than October 6 and beginning as early as June 30,” according to the letter. The affected employees are in both hourly and salary positions.