# Relationship history for MSHA mine 3301559

Current hierarchy: **Alvin  Walker → L & I Trucking Inc → L & I Pit And 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Michael Concrete Products Inc → L & I Pit And Mill; 1950-01-01 to 1979-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Michael Vernon H → L & I Pit And Mill; 1950-01-01 to 1979-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Michael Vernon H → Michael Concrete Products Inc; 1950-01-01 to 1979-06-30; source msha-controller-operator-history
- **operator_operates_mine:** L & I Trucking Inc → L & I Pit And Mill; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alvin  Walker → L & I Pit And Mill; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alvin  Walker → L & I Trucking Inc; 1979-07-01 to current/open; source msha-controller-operator-history