P. Graham Dunn’s factory in Dalton is back up and running, just days after closing because of the coronavirus.  The company’s workers though aren’t making its usual home decor products.  Instead, they are assembling plastic face masks for the nation’s doctors and nurses fighting the virus.  Production began on Friday, and after producing about 10,000 of the masks on Saturday, P. Graham Dunn officials say that starting today they hope to ramp up daily production to 20,000.