It's hard to think of that as a chain. Steve Herrell opened a store in Davis Square in 1973, Somerville (MA) many years ago called Steve's Ice Cream and it was one of the very first such places that served homemade ice-cream with mix-ins. The line was very long; I remember once a 30 minute wait. He sold the store to someone else who turned it into a chain. A few years he opened a new store called Herrell's (he couldn't use Steve's any more because of the prior sale) in Harvard Square.
In not far-away Inman Square was the one and only Legal Sea Foods. George Berkowitz was sometimes the person who manned the fish counter (it was a restaurant and fish store). At the restaurant you lined up and ordered your food and paid for it. Then you took a seat at one of the tables and waited until you were called when it was ready. Now I think it is George's son who is CEO of the chain. It is called Legal Sea Foods because it was orginally a grocery store that carried Legal trading stamps.