000 00273nam a2200109Ia 4500
008 160710s1952 xx 000 0 und d
100 _aDEPTT. OF SC. & INDUS RESEARCH
245 _aNATIONAL PHYSICAL LABORTARY
260 _bH.M.S.O.
_c1952
300 _a159
942 _2ddc
_cB
999 _c16461
_d16461