# Relationship history for MSHA mine 3503521

Current hierarchy: **Mary Lou  Garrett → W W D Corp → W.W.D. CORP.**

- 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

- **controller_controls_mine:** Mary Lou  Garrett → W.W.D. CORP.; 1991-06-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W W D Corp → W.W.D. CORP.; 2001-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mary Lou  Garrett → W W D Corp; 2001-01-01 to current/open; source msha-controller-operator-history