367547-A is referenced by 3 patents.
367,547. Anchoring bolts. PHILLIPS, N., Karachi, Upton Road, Bexleyheath, Kent. Feb. 9, 1931, No. 3988. [Class 89 (i).] Bolts are secured by a relatively soft member 4 which is placed on the bolt head and expanded so as to bite into the walls of the hole by means of a harder member 7, such as a tapered cast-iron ring, driven in by using a piece of gas pipe 8. Several pairs of hard and soft members may be used.