# Relationship history for MSHA mine 2200602

Current hierarchy: **West Lee Roy → Gulf Coast Sand & Gravel Company Inc → Pit #1**

- 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:** Interstate Sand & Gravel → Pit #1; 1987-08-01 to 1989-02-14; source msha-controller-operator-history
- **controller_controls_mine:** Saucier Marvin J & Kevin Breland → Pit #1; 1987-08-01 to 1989-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Saucier Marvin J & Kevin Breland → Interstate Sand & Gravel; 1987-08-01 to 1989-02-14; source msha-controller-operator-history
- **operator_operates_mine:** Gulf Coast Sand & Gravel Company Inc → Pit #1; 1989-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** West Lee Roy → Pit #1; 1989-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** West Lee Roy → Gulf Coast Sand & Gravel Company Inc; 1989-02-15 to current/open; source msha-controller-operator-history