# Relationship history for MSHA mine 2200194

Current hierarchy: **Ramsay Alan T → Ramsay Corp → Ramsay Sand 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:** Yazoo Ready Mix Corp → Ramsay Sand Pit; 1950-01-01 to 1987-02-11; source msha-controller-operator-history
- **controller_controls_mine:** W C  Petermann → Ramsay Sand Pit; 1950-01-01 to 1987-02-11; source msha-controller-operator-history
- **controller_controls_operator:** W C  Petermann → Yazoo Ready Mix Corp; 1950-01-01 to 1987-02-11; source msha-controller-operator-history
- **operator_operates_mine:** Ramsay Corp → Ramsay Sand Pit; 1987-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ramsay Alan T → Ramsay Sand Pit; 1987-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ramsay Alan T → Ramsay Corp; 1987-02-12 to current/open; source msha-controller-operator-history