1960     7 Oct. 920 		(advt.)	  				All lines are 60 milligauss peak-to-peak, and the line width is independent of temperature.
1969     76 100/1  				High precision with the sensitivity of several milligauss was obtained.
1990     Apr. 48/3  				Their intensity could be as high as one milligauss, about 1/1,000 of the strength of the earth's magnetic field at the surface.