| BELL | ⊕ 1955 | ↓ ↑ ⊕ Excluded from Sammet | ⊕ Bell Labs Interpreters | ⊕ United States | Bell labs compilers |
| L1 | ⊕ 1955 | ↓ ↑ ⊕ Multi-purpose | ⊕ Bell Labs Interpreters | ⊕ United States | Bell 1 interpreter |
| L2 | ⊕ 1955 | ↓ ↑ ⊕ Multi-purpose | ⊕ Bell Labs Interpreters | ⊕ United States | Bell L2 interpreter |
| L3 | ⊕ 1955 | ↓ ↑ ⊕ Multi-purpose | ⊕ Bell Labs Interpreters | ⊕ United States | Bell L3 Interpreter |
| Wolontis-Bell Interpreter | ⊕ 1955 | ↓ ↑ ⊕ Excluded from Sammet | ⊕ Bell Labs Interpreters | ⊕ United States | High level interpreter at Bell labs for 650 |