# Relationship history for MSHA mine 4500145

Current hierarchy: **Chris  Kachman → Rockeries Inc → Capital Rock Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Wilkeson Cut Stone Company → Capital Rock Quarry; 1950-01-01 to 1990-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Gordon Nyall L → Capital Rock Quarry; 1950-01-01 to 1990-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Gordon Nyall L → Wilkeson Cut Stone Company; 1950-01-01 to 1990-03-08; source msha-controller-operator-history
- **operator_operates_mine:** Rockeries Inc → Capital Rock Quarry; 1990-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chris  Kachman → Capital Rock Quarry; 1990-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris  Kachman → Rockeries Inc; 1990-03-09 to current/open; source msha-controller-operator-history