# Relationship history for MSHA mine 3304193

Current hierarchy: **Jerry Alvin  Walker → L & I Natural Resources Inc → L & I PIT & MILL**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** L & I Natural Resources Inc → L & I PIT & MILL; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alvin  Walker → L & I PIT & MILL; 1990-04-01 to 2021-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Alvin  Walker → L & I Natural Resources Inc; 1990-04-01 to 2021-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Jerry Alvin  Walker → L & I PIT & MILL; 2021-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry Alvin  Walker → L & I Natural Resources Inc; 2021-03-05 to current/open; source msha-controller-operator-history