# Relationship history for MSHA mine 3401271

Current hierarchy: **Roger Mills County-Ok → Roger Mills County → ROGER MILLS PITS**

- 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:** Schmitz Trucking Inc → ROGER MILLS PITS; 1980-05-01 to 1981-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Schmitz Gene → ROGER MILLS PITS; 1980-05-01 to 1981-08-30; source msha-controller-operator-history
- **controller_controls_operator:** Schmitz Gene → Schmitz Trucking Inc; 1980-05-01 to 1981-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Schmitz Ken → ROGER MILLS PITS; 1981-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J & K Materials Inc → ROGER MILLS PITS; 1981-08-31 to 2000-10-23; source msha-controller-operator-history
- **controller_controls_operator:** Schmitz Ken → J & K Materials Inc; 1981-08-31 to 2000-10-23; source msha-controller-operator-history
- **controller_controls_mine:** Roger Mills County-Ok → ROGER MILLS PITS; 1990-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Roger Mills County → ROGER MILLS PITS; 2000-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger Mills County-Ok → Roger Mills County; 2000-10-24 to current/open; source msha-controller-operator-history