EXHIBIT 10.12 JOINT INVESTMENT AND NON-COMPETITION AGREEMENT ---------------------------------------------- THIS JOINT INVESTMENT AND NON- COMPETITION AGREEMENT (this "Agreement") is made as of this 17th day of June, 1997 by and among RCN Telecom...Joint Investment and Non-Competition Agreement • August 22nd, 1997 • RCN Corp /De/ • Telephone communications (no radiotelephone) • Massachusetts
