BRIDGTON — In celebration of its 50 years in business, Howell Laboratories/Shively Labs will hold an open house from 3 to 7 p.m. Thursday, Nov. 13. It is at 188 Harrison Road in Bridgton. The event is open to the public.

Company President David Allen will make a brief welcoming speech at about 3:30 p.m. and tours of the facility will be available.