# Relationship history for MSHA mine 3901351

Current hierarchy: **Lonny G  Schramm; Richard W  Hiermeier → Southern Hills Rock & Gravel → Southern Hills 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:** Hiermeier Crushing → Southern Hills Pit; 1986-07-01 to 1997-10-28; source msha-controller-operator-history
- **controller_controls_mine:** Melvin  Hiermeier  et al → Southern Hills Pit; 1986-07-01 to 1997-10-28; source msha-controller-operator-history
- **controller_controls_operator:** Melvin  Hiermeier  et al → Hiermeier Crushing; 1986-07-01 to 1997-10-28; source msha-controller-operator-history
- **operator_operates_mine:** Hiermeier Crushing → Southern Hills Pit; 1997-10-29 to 2011-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Wayne  Crofutt → Southern Hills Pit; 1997-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne  Crofutt → Hiermeier Crushing; 1997-10-29 to 2011-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Southern Hills Rock & Gravel → Southern Hills Pit; 2011-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lonny G  Schramm et al → Southern Hills Pit; 2011-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lonny G  Schramm et al → Southern Hills Rock & Gravel; 2011-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard W  Hiermeier et al → Southern Hills Rock & Gravel; 2011-08-18 to current/open; source msha-controller-operator-history