# Relationship history for MSHA mine 2500169

Current hierarchy: **Jason R Jacob → Spud Sand & Gravel LLC → Spud Sand & Gravel**

- 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:** Hinrichsen Sand & Gravel → Spud Sand & Gravel; 1950-01-01 to 2020-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Sharon  Hinrichsen  et al → Spud Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sharon  Hinrichsen  et al → Hinrichsen Sand & Gravel; 1950-01-01 to 2020-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence E  Hinrichsen  et al → Hinrichsen Sand & Gravel; 1950-01-01 to 2020-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Spud Sand & Gravel LLC → Spud Sand & Gravel; 2020-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jason R Jacob → Spud Sand & Gravel; 2020-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason R Jacob → Spud Sand & Gravel LLC; 2020-04-01 to current/open; source msha-controller-operator-history