In "The Dancing Chain", there are line drawings of several 1x3 derailleur setups from the 1930s that are fitted with little chain guides over the chainwheel to prevent tossing the chain. In the 1960s Fred DeLong took some high-speed pictures of a 1x set up on a stand in a shop to understand why it happens. The new millennium, and it's still being "discovered".

The other way to keep from tossing the chain on a 1x set up. This technique has been working well since the 1890s.

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tcs