![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgDELVh8h9-6IUjh50Tcdb3Joixfjc4BBm7hSkZrEe_i71exYcYyHF8XMXoZGxqMSJsqPrrqSGLxzfzMa9UQC1i58wAlU4Pj-v6RaYh_lQaGdN6AVZZ9ZjqyM7wVTW0HYCHiCEQ4n7Rb4qu/s400/0610091120.jpg)
Also using a clock movement, Sangamo made the Tachograph, a device mounted in trucks that charted driving speeds and times so companies could monitor drivers’ activities. http://www.sangamoclocks.com/history.htm
a really early version can be seen here: http://www.sangamoclocks.com/History/f38.jpg
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