# Relationship history for MSHA mine 0503797

Current hierarchy: **Stephen  Schnurr → Rocky Mountain Materials Inc → Cripple Creek 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:** Rocky Mountain Materials Inc → Cripple Creek Pit; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stephen  Schnurr → Cripple Creek Pit; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  Schnurr → Rocky Mountain Materials Inc; 1982-08-01 to current/open; source msha-controller-operator-history