# Relationship history for MSHA mine 4405474

Current hierarchy: **Davis Hassel → Benchmark Mining Company → Rocklick Mine No 1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Jnodow Coal Corp → Rocklick Mine No 1; 1980-08-01 to 1981-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Richardson Jackie → Rocklick Mine No 1; 1980-08-01 to 1981-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Richardson Jackie → Jnodow Coal Corp; 1980-08-01 to 1981-08-19; source msha-controller-operator-history
- **operator_operates_mine:** Benchmark Mining Company Inc → Rocklick Mine No 1; 1981-08-20 to 1982-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Sullivan Dan G-Delmer Vencill Et Al → Rocklick Mine No 1; 1981-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sullivan Dan G-Delmer Vencill Et Al → Benchmark Mining Company Inc; 1981-08-20 to 1982-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Benchmark Mining Company → Rocklick Mine No 1; 1982-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Davis Hassel Et Al → Rocklick Mine No 1; 1982-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davis Hassel Et Al → Benchmark Mining Company; 1982-01-06 to current/open; source msha-controller-operator-history