➀ During the first 10 months of 1960, US manufacturers averaged 10 million transistors sold per month, totaling nearly £9 million in value. This represented a 33% increase from the monthly average of 7.5 million units in 1959. ➁ The story from Electronics Weekly's January 25, 1961, issue mentioned that US manufacturers sold nearly 102 million transistors between January and October 1960, with an October total of 12.2 million units. ➂ The value of US factory transistor sales in the first 10 months of 1960 was £88 million, with a projection for the full year to reach around £100 million.