I,ve managed to find a 1/2 dozen 2 threads 143,s in a localized 10 mile area,and facts show that there also were telegragh lines also present,(1894) using ponies, and on old finds (102,s no emb canadain s) have been found,but no 120,s, would it be a fair statement to say they might of used the 120,s along with the 143,s( hope,n they were produced in the same time frame ,as well as used) Guess time will tell ;;
Andy