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| circular level | |||
| spirit-level; tube (filled with spirit); universal level; spirit level | |||
| circular spirit level | |||
| circular level (bubble, vial) | |||
| circular level (with bubble) | |||
| spherical bubble level | |||
| box level | |||
| Dosenlibelle: 1 phrase in 1 subject |
| Optics branch of physics | 1 |