000 00310pam a2200133a 44500
082 _aBTS
_bMONO 1892
100 _aGilbert,E N
245 1 _aN--TERMINAL SWITCHING CIRCUITS
260 _a
_b
_c1951
300 _a21
500 _aBound With Bts Mono 1881-91,1893-99.
964 _gCIRC
997 _aTR19739 C
999 _c402360
_d402360