# Relationship history for MSHA mine 3605588

Current hierarchy: **Michael R  Burns → B & L Coal Company → B And L Coal**

- 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:** B & C Coal Company → B And L Coal; 1975-05-01 to 1976-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Canavon George & Robert Burns → B And L Coal; 1975-05-01 to 1976-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Canavon George & Robert Burns → B & C Coal Company; 1975-05-01 to 1976-02-29; source msha-controller-operator-history
- **operator_operates_mine:** B & L Coal Company → B And L Coal; 1976-03-01 to 1979-07-01; source msha-controller-operator-history
- **controller_controls_mine:** Burns Robert B--Pat & George Lally → B And L Coal; 1976-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burns Robert B--Pat & George Lally → B & L Coal Company; 1976-03-01 to 1979-07-01; source msha-controller-operator-history
- **operator_operates_mine:** B & L Coal Company → B And L Coal; 1979-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael R  Burns → B And L Coal; 1979-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael R  Burns → B & L Coal Company; 1979-07-02 to current/open; source msha-controller-operator-history