# Relationship history for MSHA mine 1101226

Current hierarchy: **Aupperle Kenneth → Peoria Sand & Gravel Inc → Stevers 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Stevers Inc → Stevers Pit; 1950-01-01 to 1988-05-03; source msha-controller-operator-history
- **controller_controls_mine:** Schmitt T S → Stevers Pit; 1950-01-01 to 1988-05-03; source msha-controller-operator-history
- **controller_controls_operator:** Schmitt T S → Stevers Inc; 1950-01-01 to 1988-05-03; source msha-controller-operator-history
- **operator_operates_mine:** Peoria Sand & Gravel Inc → Stevers Pit; 1988-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aupperle Kenneth → Stevers Pit; 1988-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aupperle Kenneth → Peoria Sand & Gravel Inc; 1988-05-04 to current/open; source msha-controller-operator-history