Possibly the 64 spindle throstle machine named in T10889.00A. The Merrimack Mfg Co. was an offshoot of the Boston Mfg. Co, which first operated textile mills in Waltham, Massachusetts. The Merrimack company operated in Lowell, Massachusetts. Among its many oeprations in Lowell was a machine shop. It is likely that this spinning frame was the product of that shop.