# Relationship history for MSHA mine 4300818

Current hierarchy: **Alfred  Senecal; Cheryl  Senecal → Omega Excavation and Site Development → OMEGA 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:** Omega Excavation and Site Development → OMEGA QUARRY; 2023-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cheryl  Senecal et al → OMEGA QUARRY; 2023-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cheryl  Senecal et al → Omega Excavation and Site Development; 2023-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alfred  Senecal et al → Omega Excavation and Site Development; 2023-08-15 to current/open; source msha-controller-operator-history