# Relationship history for MSHA mine 4103179

Current hierarchy: **Light Ronald L → Southern Soil Supply → Southern Soil Supply**

- 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:** John R  Weisman → Southern Soil Supply; 1980-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Colorado Materials Inc → Southern Soil Supply; 1983-06-01 to 1987-03-31; source msha-controller-operator-history
- **controller_controls_operator:** John R  Weisman → Colorado Materials Inc; 1983-06-01 to 1987-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Southern Soil Supply → Southern Soil Supply; 1987-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Light Ronald L → Southern Soil Supply; 1987-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Light Ronald L → Southern Soil Supply; 1987-04-01 to current/open; source msha-controller-operator-history