# Relationship history for MSHA mine 1505248

Current hierarchy: **Osborne Mitchell → M & R Coal Company → No 1 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

- **operator_operates_mine:** Harlan Mason Coal Company Inc → No 1 Mine; 1950-01-01 to 1973-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Stapleton Charles → No 1 Mine; 1950-01-01 to 1973-12-14; source msha-controller-operator-history
- **controller_controls_operator:** Stapleton Charles → Harlan Mason Coal Company Inc; 1950-01-01 to 1973-12-14; source msha-controller-operator-history
- **operator_operates_mine:** M & R Coal Company → No 1 Mine; 1973-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Osborne Mitchell → No 1 Mine; 1973-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Osborne Mitchell → M & R Coal Company; 1973-12-15 to current/open; source msha-controller-operator-history