# Relationship history for MSHA mine 2501220

Current hierarchy: **Peter H  Emerson; Velma  Rising → Emerson Excavting Inc → Rising 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Emerson Excavting Inc → Rising Pit; 2004-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Velma  Rising et al → Rising Pit; 2004-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Velma  Rising et al → Emerson Excavting Inc; 2004-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter H  Emerson et al → Emerson Excavting Inc; 2004-06-17 to current/open; source msha-controller-operator-history