CD 139
COMBINATION SAFETY
[010] (F-Skirt) COMBINATION/SAFETY (R-Skirt) PAT. APPL'D. FOR. SBAqua . . . . . . . . . . . $15,000-20,000
A quote from an ad in 1909 says "The 'Combination Safety' insulator, which is designed to prevent the dropping of the line wire to the cross-arm if the tie-wire breaks and to eliminate the necessity of tying to every insulator." Although this says PATENT APPLIED FOR a patent was granted for this design.