Hanger shoulders and boyle’s air pump: what they have in common

1. Step 1. Hanger shoulders — is part of — Clothes hanger. An arch shaped to the shoulders.
2. Step 2. Clothes hanger — is made of — Steel. Wire.
3. Step 3. Steel — is material for — Milking machine. The buckets are stainless steel and tinplate.
4. Step 4. Milking machine — has part — Vacuum pump. A vacuum pump.
5. Step 5. Vacuum pump — evolved into — Boyle’s air pump. An improved version of Guericke’s pump.

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