# Relationship history for MSHA mine 4201678

Current hierarchy: **L Jay  Sorensen → Sorensen Sand & Gravel Company → Slaugh 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:** L Jay  Sorensen → Slaugh Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Reidhead Jimmie N → Slaugh Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Uintah Basin Concrete → Slaugh Pit; 1980-05-01 to 1981-05-11; source msha-controller-operator-history
- **controller_controls_operator:** Reidhead Jimmie N → Uintah Basin Concrete; 1980-05-01 to 1981-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Sorensen Sand & Gravel Company → Slaugh Pit; 1981-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** L Jay  Sorensen → Sorensen Sand & Gravel Company; 1981-05-12 to current/open; source msha-controller-operator-history