Wooden harness arch and particle accelerator: what they have in common

1. Step 1. Wooden harness arch — is part of — Horse collar. An arch over the neck (Russian harness).
2. Step 2. Horse collar — is made of — Leather. The collar and traces are leather.
3. Step 3. Leather — is material for — Footwear. Leather.
4. Step 4. Footwear — is made of — Vulcanized rubber. A rubber sole.
5. Step 5. Vulcanized rubber — is material for — Van de Graaff generator. The belt is rubber.
6. Step 6. Van de Graaff generator — evolved into — Particle accelerator. Early accelerators.

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