Point-contact transistor and electrical grid: what they have in common

1. Step 1. Point-contact transistor — is a kind of — Transistor. The first transistor.
2. Step 2. Transistor — is part of — Inverter. Switches built on power transistors.
3. Step 3. Inverter — is part of — Grid battery storage. Inverters.
4. Step 4. Grid battery storage — is part of — Electrical grid. Storage balances the grid.

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