# Relationship history for MSHA mine 4104516

Current hierarchy: **Dudley  Harrison; Doris  Harrison → Harrison Family L.P. → Harrison 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Harrison Family L.P. → Harrison Rock Quarry; 2005-01-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dudley  Harrison et al → Harrison Rock Quarry; 2005-01-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dudley  Harrison et al → Harrison Family L.P.; 2005-01-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Doris  Harrison et al → Harrison Family L.P.; 2005-01-12 to current/open; source msha-controller-operator-history