When cable cars were hi-tech

Innovation born in San Francisco triggered a hi-tech revolution that changed America and much of the world. We’re not talking here about the digital innovations from Silicon Valley. Nor the analog innovation by Philo T. Farnsworth, in a little building on Green Street in 1927, that gave birth to television. We’re talking about mechanical innovation 150 years ago that began a revolution in how people move around cities.

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