# Relationship history for MSHA mine 4104237

Current hierarchy: **Tri Dal Excavation & Utilities Inc; Richard J  Muller → Tri Dal Ltd → QUIGLEY 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:** Tri Dal Ltd → QUIGLEY PIT; 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard J  Muller et al → QUIGLEY PIT; 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard J  Muller et al → Tri Dal Ltd; 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tri Dal Excavation & Utilities Inc et al → Tri Dal Ltd; 2000-11-01 to current/open; source msha-controller-operator-history