Nice Op Amp article in 'Silicon Chip' mag

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Hi all, just got my latest dose of 'Silicon Chip' magazine. In the August edition there's 'The history of Op Amps'; "Harold S. Black's discovery of negative feedback paved the way for the development of operational amplifiers, which are widely used in all sorts of electronic devices, especially for audio"
The eight page article is written by Roderick Wall & Nicholas Vinen.
I hope it's not rude posting a link to the mag. And yes, the mag is a beaut read.
https://www.siliconchip.com.au/Images/Issues/Thumbnail/Issue_Preview_7651_600_805.jpg

 

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This link gets closer. Only the first two pages of the article are available for free.