00423cam a22000977a 4500008004000000082001500040245014400055260005000199300000700249700006900256180718b1952   xxu||||| |||| 00| 0 eng d  aT82 In2n/2  aUnits & standards of measurements employed at the national physical laboratorycby Department of Scientific and Industrial Research, United  aLondonbHer Majesty's Stationery Officec1952  a8p  aUnited Kingdom. Department of Scientific and Industrial Research