Piano hammer and hollerith tabulator: what they have in common

1. Step 1. Piano hammer — is part of — Piano. Hammers strike the strings.
2. Step 2. Piano — includes — Player piano. A piano.
3. Step 3. Player piano — works like — Jacquard loom. A perforated medium controls a machine — a weaving one in one case, a musical one in the other.
4. Step 4. Jacquard loom — uses — Punched card. Each punched card sets one pass of the pattern.
5. Step 5. Punched card — is used in — Hollerith tabulator. The 1890 census data was encoded on punched cards.

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