Messrs. Clap & Co. having secured a good location by purchasing the factory of Runyon Harris, engaged extensively in the manufacturing business, which was continued by their several successors down to the year 1864, when results of the civil war (so disastrous to Maryland's manufacturing industries) caused its temporary abandonment, but the enterprise established by Messrs. Aaron Clap & Co. has, by an unbroken series of firms, continued to the present time, being now represented by Brigham, Hopkins & Co. In 1817 Henry Lamson kept a first-class retail hat store at No. 5 South Calvert street, the locality now the southwest corner of Carroll Hall building. In 1822 the firm of Aaron Clap & Co. and Henry Lamson consolidated, making the firm Lamson & Clap, and continuing the retail business at No. 5 South Calvert street, in connection with manufactory. Mr. Lamson in 1827 went to the West Indies in search of health, and died on the island of St. Thomas. He was a gentleman of much social refinement, and was held in high esteem as a citizen. In the year 1827 the firm of Lamson & Clap was dissolved by the death of Mr. Lamson, and Mr. Wm. P. Cole was admitted, the firm becoming Clap, Cole & Co. After the death of Mr. Clap, which occurred in 1834, his widow's interest was retained and the firm was changed to Cole, Clap & Co.; following this, Mrs. Clap retired and Mr. Hugh J. Morrison became a member of the firm, which was made Cole & Morrison. In 1842 Thaddeus and William G. Craft became interested, the firm becoming Cole, Craft & Co., still continuing business at No. 5 South Calvert street (the same place established by Lamson & Clap). About the year 1850 the firm removed to No. 218 West Baltimore street, now 10 East Baltimore street and occupied by Likes, Berwanger & Co., clothiers. In 1853 Mr. Cole associated with him his son, William R., the firm being Wm. P. Cole & Son. In 1857 the firm moved to No. 274 West Baltimore street, present number 46, where they remained until the year 1867, removing then to occupy the building which they had erected at No. 30 Sharp street, now 24 Hopkins Place. In 1861 Mr. Wm. T. Brigham was admitted to the firm, it then becoming Wm. R. Cole & Co. In 1870 the firm name was again changed to Cole, Brigham & Co., which was dissolved in 1877 by the withdrawal of Mr. Brigham, in which year Mr. Brigham associated with Robert D. Hopkins as the firm of Brigham & Hopkins, locating at No. 128 West Fayette street (present number 211), which firm of Brigham & Hopkins continued until 1887, when it was changed to Brigham, Hopkins & Co. by the admission of Isaac H. Francis. In 1884 Brigham & Hopkins erected the large and handsome building at the corner of German and Paca streets, which the present firm continue to occupy as a factory and salesroom.