# Relationship history for MSHA mine 1600803

Current hierarchy: **Johnson Max L → Em Jay Materials Inc → Gause 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:** Plaquemine Sand & Gravel Company Inc → Gause Pit; 1950-01-01 to 1980-06-16; source msha-controller-operator-history
- **controller_controls_mine:** Thomason H Allen → Gause Pit; 1950-01-01 to 1980-06-16; source msha-controller-operator-history
- **controller_controls_operator:** Thomason H Allen → Plaquemine Sand & Gravel Company Inc; 1950-01-01 to 1980-06-16; source msha-controller-operator-history
- **operator_operates_mine:** Grav-Co Inc → Gause Pit; 1980-06-17 to 1992-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Doherty Louis → Gause Pit; 1980-06-17 to 1992-06-24; source msha-controller-operator-history
- **controller_controls_operator:** Doherty Louis → Grav-Co Inc; 1980-06-17 to 1992-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Max L → Gause Pit; 1985-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Em Jay Materials Inc → Gause Pit; 1992-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Max L → Em Jay Materials Inc; 1992-06-25 to current/open; source msha-controller-operator-history