My last anecdote was about how it took 50 years between conception and commercialisation of the ball pen, an apparently simple innovation that is basic to our lives now (BS, 3 March 2017). The article drew a noteworthy response from an IIT contemporary, Professor Anjan Raichaudhuri, who pointed to another innovation with a comparable diffusion time. His hint was that such diffusion times may well be a norm. For this column, I review the development of the dry copier, an essential part of our lives, and whose innovation biography we don’t contemplate.
When I began my professional career in the
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