Universal gravitation e pneumatic tube: o que têm em comum

1. Passo 1. Universal gravitation — é utilizado em — Pin tumbler lock. The pins drop into holes in the bolt under their own weight.
2. Passo 2. Pin tumbler lock — faz parte de — Lock and key. The pins keep the cylinder from turning without a key.
3. Passo 3. Lock and key — faz parte de — Letter box. A lockable door for collection.
4. Passo 4. Letter box — utiliza — Postal service. The post.
5. Passo 5. Postal service — inclui — Pneumatic tube. The post.

Abrir Evothings