# Relationship history for MSHA mine 2500836

Current hierarchy: **Rick Z  Rowse → Rowse Sand & Gravel → Chambers Pit**

- 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:** Jarman Sand & Gravel → Chambers Pit; 1950-01-01 to 2003-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Daniel Gordon  Jarman → Chambers Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel Gordon  Jarman → Jarman Sand & Gravel; 1950-01-01 to 2003-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Rowse Sand & Gravel → Chambers Pit; 2003-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rick Z  Rowse → Chambers Pit; 2003-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick Z  Rowse → Rowse Sand & Gravel; 2003-05-15 to current/open; source msha-controller-operator-history