# Relationship history for MSHA mine 1502269

Current hierarchy: **Nicholas  Saylor → F & D Coal Company Inc → No 4 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Osborne Coal Company → No 4 Mine; 1950-01-01 to 1974-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Osborne Randall → No 4 Mine; 1950-01-01 to 1974-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Osborne Randall → Osborne Coal Company; 1950-01-01 to 1974-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Nicholas  Saylor et al → No 4 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & D Coal Company → No 4 Mine; 1974-11-01 to 1974-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Parsons Clarence → No 4 Mine; 1974-11-01 to 1974-12-04; source msha-controller-operator-history
- **controller_controls_operator:** Parsons Clarence → C & D Coal Company; 1974-11-01 to 1974-12-04; source msha-controller-operator-history
- **operator_operates_mine:** F & D Coal Company Inc → No 4 Mine; 1974-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nicholas  Saylor et al → F & D Coal Company Inc; 1974-12-05 to current/open; source msha-controller-operator-history