# Relationship history for MSHA mine 3503651

Current hierarchy: **Williams Revocable Trust → Williams Aggregate, Inc → Williams Aggregate, Inc.**

- 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:** Grizzly Rock Product LLC → Williams Aggregate, Inc.; 2006-08-02 to 2024-08-20; source msha-controller-operator-history
- **controller_controls_mine:** Walter  Williams et al → Williams Aggregate, Inc.; 2006-08-02 to 2017-04-23; source msha-controller-operator-history
- **controller_controls_operator:** Walter  Williams et al → Grizzly Rock Product LLC; 2006-08-02 to 2017-04-23; source msha-controller-operator-history
- **controller_controls_operator:** David L.  Groves et al → Grizzly Rock Product LLC; 2006-08-02 to 2017-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Williams Revocable Trust → Williams Aggregate, Inc.; 2017-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williams Revocable Trust → Grizzly Rock Product LLC; 2017-04-24 to 2024-08-20; source msha-controller-operator-history
- **operator_operates_mine:** Williams Aggregate, Inc → Williams Aggregate, Inc.; 2024-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Williams Revocable Trust → Williams Aggregate, Inc.; 2024-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williams Revocable Trust → Williams Aggregate, Inc; 2024-08-21 to current/open; source msha-controller-operator-history