# Relationship history for MSHA mine 0503962

Current hierarchy: **Chris  Pyles; Sue  Pyles → Ute Pass Concrete Sand & Gravel Inc → UTE PASS CONCRETE SAND & GRAVEL**

- 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:** Pine Creek Aggregates → UTE PASS CONCRETE SAND & GRAVEL; 1984-06-01 to 1986-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Prevost → UTE PASS CONCRETE SAND & GRAVEL; 1984-06-01 to 1986-04-13; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Prevost → Pine Creek Aggregates; 1984-06-01 to 1986-04-13; source msha-controller-operator-history
- **operator_operates_mine:** Ute Pass Concrete Sand & Gravel Inc → UTE PASS CONCRETE SAND & GRAVEL; 1986-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chris  Pyles et al → UTE PASS CONCRETE SAND & GRAVEL; 1986-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris  Pyles et al → Ute Pass Concrete Sand & Gravel Inc; 1986-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sue  Pyles et al → Ute Pass Concrete Sand & Gravel Inc; 1986-04-14 to current/open; source msha-controller-operator-history