# Relationship history for MSHA mine 2200438

Current hierarchy: **Anderson William C → Works Gravel & Construction → THE WORKS GRAVEL & CONST.**

- 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:** L B Street Gravel Company → THE WORKS GRAVEL & CONST.; 1950-01-01 to 1992-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Street L B → THE WORKS GRAVEL & CONST.; 1950-01-01 to 1992-02-12; source msha-controller-operator-history
- **controller_controls_operator:** Street L B → L B Street Gravel Company; 1950-01-01 to 1992-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Tara Wildlife Management & Services Inc → THE WORKS GRAVEL & CONST.; 1992-02-13 to 1995-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Bryant Magalon → THE WORKS GRAVEL & CONST.; 1992-02-13 to 1995-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Bryant Magalon → Tara Wildlife Management & Services Inc; 1992-02-13 to 1995-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Works Gravel & Construction → THE WORKS GRAVEL & CONST.; 1996-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Anderson William C → THE WORKS GRAVEL & CONST.; 1996-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anderson William C → Works Gravel & Construction; 1996-01-01 to current/open; source msha-controller-operator-history