# Relationship history for MSHA mine 4605610

Current hierarchy: **Richmond Robert W & Dare Mc Kinney → B & M Coal Company → No 3**

- 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

- **controller_controls_mine:** Baker Kenneth & Bobby Mullins → No 3; 1975-05-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & M Coal Company → No 3; 1977-09-01 to 1981-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Baker Kenneth & Bobby Mullins → B & M Coal Company; 1977-09-01 to 1981-01-31; source msha-controller-operator-history
- **operator_operates_mine:** B & M Coal Company → No 3; 1981-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richmond Robert W & Dare Mc Kinney → No 3; 1981-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richmond Robert W & Dare Mc Kinney → B & M Coal Company; 1981-02-01 to current/open; source msha-controller-operator-history