# Relationship history for MSHA mine 2103543

Current hierarchy: **Jamie E  Okerlund → Okerlund Gravel → Okerlund 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:** Okerlund Gravel → Okerlund Gravel; 2006-06-08 to 2020-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Les David  Okerlund → Okerlund Gravel; 2006-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Les David  Okerlund → Okerlund Gravel; 2006-06-08 to 2020-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Okerlund Gravel → Okerlund Gravel; 2020-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jamie E  Okerlund → Okerlund Gravel; 2020-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jamie E  Okerlund → Okerlund Gravel; 2020-08-08 to current/open; source msha-controller-operator-history