# Relationship history for MSHA mine 2902478

Current hierarchy: **William J Sweatt Revocable Trust; Brad G Larson; Nancy E Larson → Sweatt Construction Inc → Crusher 4**

- 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

- **controller_controls_mine:** William J  Sweatt → Crusher 4; 2012-08-01 to 2022-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Sweatt Construction Inc → Crusher 4; 2017-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William J  Sweatt → Sweatt Construction Inc; 2017-08-31 to 2022-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Brad G Larson et al → Crusher 4; 2022-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad G Larson et al → Sweatt Construction Inc; 2022-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William J Sweatt Revocable Trust et al → Sweatt Construction Inc; 2022-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nancy E Larson et al → Sweatt Construction Inc; 2022-03-30 to current/open; source msha-controller-operator-history