000 00306pam a2200133a 44500
082 _a621.38151
_bC497o
100 _aCisin, Harry George
245 1 _aOVER 11,000 DIRECT TUBE SUBSTITUTES
260 _aN. Y.
_b
_c1963
300 _a73
650 _aElectron Tubes
964 _gCIRC
997 _a54658 C
999 _c413915
_d413915