# Relationship history for MSHA mine 2200846

Current hierarchy: **Matthew  Sojourner; Benjamin  Sojourner → solid rock sand and gravel → hwy 27 plant**

- 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

- **operator_operates_mine:** solid rock sand and gravel → hwy 27 plant; 2022-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Matthew  Sojourner et al → hwy 27 plant; 2022-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew  Sojourner et al → solid rock sand and gravel; 2022-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin  Sojourner et al → solid rock sand and gravel; 2022-12-29 to current/open; source msha-controller-operator-history