# Relationship history for MSHA mine 1501672

Current hierarchy: **Conroy  Coleman → Coleman & Runyon Coal Company → No 72-Mine**

- 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:** Conroy  Coleman  et al → No 72-Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Anderson & Bartley Coal Company → No 72-Mine; 1950-01-01 to 1971-03-15; source msha-controller-operator-history
- **controller_controls_mine:** Anderson Andrew & Elmer Bartley → No 72-Mine; 1950-01-01 to 1971-03-15; source msha-controller-operator-history
- **controller_controls_operator:** Anderson Andrew & Elmer Bartley → Anderson & Bartley Coal Company; 1950-01-01 to 1971-03-15; source msha-controller-operator-history
- **operator_operates_mine:** Coleman & Runyon Coal Company → No 72-Mine; 1971-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Conroy  Coleman  et al → Coleman & Runyon Coal Company; 1971-03-16 to current/open; source msha-controller-operator-history