000 00304nam a2200109Ia 4500
008 220201s1912 xx 000 0 eng d
100 _aMarshall, N
245 0 _aPrinciples of relay interlocking & control panels 18
260 _bInstitute of railway signed engineers
_c1912
300 _a49
942 _2ddc
999 _c75849
_d75849