# Relationship history for MSHA mine 1519752

Current hierarchy: **Larry  Hamilton → R & S Coal → 2A**

- 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:** Henry  Chaney  et al → 2A; 2005-05-26 to 2018-08-12; source msha-controller-operator-history
- **controller_controls_mine:** Clark D  Pergrem → 2A; 2013-10-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Matt/Co, Inc. → 2A; 2014-06-27 to 2017-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Clark D  Pergrem → Matt/Co, Inc.; 2014-06-27 to 2017-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Cheyenne Enterprises Inc. → 2A; 2017-11-15 to 2018-12-12; source msha-controller-operator-history
- **controller_controls_operator:** Henry  Chaney  et al → Cheyenne Enterprises Inc.; 2017-11-15 to 2018-08-12; source msha-controller-operator-history
- **controller_controls_operator:** Greg  Damron  et al → Cheyenne Enterprises Inc.; 2017-11-15 to 2018-08-12; source msha-controller-operator-history
- **controller_controls_mine:** Greg  Damron → 2A; 2018-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greg  Damron → Cheyenne Enterprises Inc.; 2018-08-13 to 2018-12-12; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Hamilton → 2A; 2018-08-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R & S Coal → 2A; 2018-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Hamilton → R & S Coal; 2018-12-13 to current/open; source msha-controller-operator-history