# Relationship history for MSHA mine 1515169

Current hierarchy: **Nicholas  Saylor → New Harlan Block Coal Company Inc → Mason No 7**

- 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:** Nicholas  Saylor et al → Mason No 7; 1978-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Turner → Mason No 7; 1980-01-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ages Creek Fuel Inc → Mason No 7; 1985-04-01 to 1992-12-27; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Turner → Ages Creek Fuel Inc; 1985-04-01 to 1992-12-27; source msha-controller-operator-history
- **operator_operates_mine:** New Harlan Block Coal Company Inc → Mason No 7; 1992-12-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nicholas  Saylor et al → New Harlan Block Coal Company Inc; 1992-12-28 to current/open; source msha-controller-operator-history