# Relationship history for MSHA mine 4602504

Current hierarchy: ** → Hobet Mining Inc → No 3 Surface**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Hobet Mining & Construction Company Inc → No 3 Surface; 1950-01-01 to 1977-04-30; source msha-controller-operator-history
- **controller_controls_mine:** F B  Nutter Sr → No 3 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** F B  Nutter Sr → Hobet Mining & Construction Company Inc; 1950-01-01 to 1977-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Hobet Mining Inc → No 3 Surface; 1977-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc et al → No 3 Surface; 1977-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Hobet Mining Inc; 1977-05-01 to current/open; source msha-controller-operator-history