# Relationship history for MSHA mine 4300063

Current hierarchy: **Kurt M  Swenson → Rock Of Ages Quarries Inc → Wells-Lamson Quarry**

- 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:** Wells-Lamson Quarry Company Inc → Wells-Lamson Quarry; 1950-01-01 to 1986-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Kelley James M Ii → Wells-Lamson Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelley James M Ii → Wells-Lamson Quarry Company Inc; 1950-01-01 to 1986-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Rock Of Ages Quarries Inc → Wells-Lamson Quarry; 1986-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kurt M  Swenson → Wells-Lamson Quarry; 1986-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kurt M  Swenson → Rock Of Ages Quarries Inc; 1986-05-15 to current/open; source msha-controller-operator-history