# Relationship history for MSHA mine 4406077

Current hierarchy: **Mullins Wallace → R B & F Inc → No 1 Strip**

- 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:** R B & F Inc → No 1 Strip; 1984-03-01 to 1985-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Roberts Wade D → No 1 Strip; 1984-03-01 to 1985-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Roberts Wade D → R B & F Inc; 1984-03-01 to 1985-04-28; source msha-controller-operator-history
- **operator_operates_mine:** R B & F Inc → No 1 Strip; 1985-04-29 to 1985-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Shelcy → No 1 Strip; 1985-04-29 to 1985-07-18; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Shelcy → R B & F Inc; 1985-04-29 to 1985-07-18; source msha-controller-operator-history
- **operator_operates_mine:** R B & F Inc → No 1 Strip; 1985-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Wallace → No 1 Strip; 1985-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Wallace → R B & F Inc; 1985-07-19 to current/open; source msha-controller-operator-history