# Relationship history for MSHA mine 2602172

Current hierarchy: **CSR Ltd → Wmk Transit Mix → Wmk N L V Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** CSR Ltd → Wmk N L V Sand & Gravel; 1990-02-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Metropolitan Sand & Gravel → Wmk N L V Sand & Gravel; 1990-10-01 to 1991-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Leavitt Linda → Wmk N L V Sand & Gravel; 1990-10-01 to 1991-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Leavitt Linda → Metropolitan Sand & Gravel; 1990-10-01 to 1991-04-14; source msha-controller-operator-history
- **operator_operates_mine:** All Star Ready Mix Inc → Wmk N L V Sand & Gravel; 1991-04-15 to 1991-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Wadkins Dennis L → Wmk N L V Sand & Gravel; 1991-04-15 to 1991-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Wadkins Dennis L → All Star Ready Mix Inc; 1991-04-15 to 1991-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Wmk Transit Mix → Wmk N L V Sand & Gravel; 1992-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CSR Ltd → Wmk Transit Mix; 1992-01-01 to current/open; source msha-controller-operator-history