# Relationship history for MSHA mine 4002634

Current hierarchy: **Smith Eugene → Jacksboro Coal Corp → Jacksboro Coal Corp #1 Surface**

- 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:** Round Mountain Mining Corp → Jacksboro Coal Corp #1 Surface; 1980-01-01 to 1981-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Padgett Douglas & Joseph Koker → Jacksboro Coal Corp #1 Surface; 1980-01-01 to 1981-05-13; source msha-controller-operator-history
- **controller_controls_operator:** Padgett Douglas & Joseph Koker → Round Mountain Mining Corp; 1980-01-01 to 1981-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Jacksboro Coal Corp → Jacksboro Coal Corp #1 Surface; 1981-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Eugene → Jacksboro Coal Corp #1 Surface; 1981-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Eugene → Jacksboro Coal Corp; 1981-05-14 to current/open; source msha-controller-operator-history