# Relationship history for MSHA mine 3608511

Current hierarchy: **Robert  Watson; Ruth Ann  Watson → Watson Enterprises → WALKER 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Watson Enterprises → WALKER PIT; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ruth Ann  Watson et al → WALKER PIT; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ruth Ann  Watson et al → Watson Enterprises; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Watson et al → Watson Enterprises; 1995-05-01 to current/open; source msha-controller-operator-history