# Relationship history for MSHA mine 2200621

Current hierarchy: **W G  Cook III → Golden Triangle Sand & Gravel Inc → SAND RD. 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

- **controller_controls_mine:** W G  Cook III → SAND RD. PIT; 1990-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Golden Triangle Sand & Gravel Inc → SAND RD. PIT; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W G  Cook III → Golden Triangle Sand & Gravel Inc; 1990-06-01 to current/open; source msha-controller-operator-history