# Relationship history for MSHA mine 1517709

Current hierarchy: **Hall Terry R → Triple H Coal Usa Inc → Mine #1**

- 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:** High Ridge Mining Inc → Mine #1; 1995-09-01 to 1997-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Maynard Dan Et Al → Mine #1; 1995-09-01 to 1997-12-04; source msha-controller-operator-history
- **controller_controls_operator:** Maynard Dan Et Al → High Ridge Mining Inc; 1995-09-01 to 1997-12-04; source msha-controller-operator-history
- **operator_operates_mine:** Triple H Coal Usa Inc → Mine #1; 1997-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hall Terry R → Mine #1; 1997-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Terry R → Triple H Coal Usa Inc; 1997-12-05 to current/open; source msha-controller-operator-history