# Relationship history for MSHA mine 4608240

Current hierarchy: **William F  Adams → WA Mining Inc → Caretta #2 Mine**

- 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:** Mc Dowell Energy Inc → Caretta #2 Mine; 1992-10-01 to 1996-03-17; source msha-controller-operator-history
- **controller_controls_mine:** Truong  Van Nguyen et al → Caretta #2 Mine; 1992-10-01 to 1996-03-17; source msha-controller-operator-history
- **controller_controls_operator:** Truong  Van Nguyen et al → Mc Dowell Energy Inc; 1992-10-01 to 1996-03-17; source msha-controller-operator-history
- **operator_operates_mine:** WA Mining Inc → Caretta #2 Mine; 1996-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William F  Adams → Caretta #2 Mine; 1996-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William F  Adams → WA Mining Inc; 1996-03-18 to current/open; source msha-controller-operator-history