# Relationship history for MSHA mine 3606930

Current hierarchy: **Stott James M → Northern Counties Coal Company Inc → Johnson Run Operation**

- 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:** Northern Coal & Clay Company Inc → Johnson Run Operation; 1980-01-01 to 1981-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Francis J  Hamilton et al → Johnson Run Operation; 1980-01-01 to 1981-10-13; source msha-controller-operator-history
- **controller_controls_operator:** Francis J  Hamilton et al → Northern Coal & Clay Company Inc; 1980-01-01 to 1981-02-23; source msha-controller-operator-history
- **operator_operates_mine:** Northern Counties Coal Company Inc → Johnson Run Operation; 1981-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stott James M → Johnson Run Operation; 1981-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stott James M → Northern Counties Coal Company Inc; 1981-02-24 to current/open; source msha-controller-operator-history