The simple diagram above strikingly illustrates one ofthe mechanical advantages of co-operation. It shows that six persons can nowtalk over two pairs of wires at the same time that eight telegraph operators send eight telegrams over the same wires. With such joint ... L00 No. l3l-F Sportsmana#39;s Stone; Round, in pigskin case with strap Ior attaching to belt No. ... Established Ir.Ar 1999 Ruby street Rockford.