# Relationship history for MSHA mine 3610144

Current hierarchy: **Devin  Hollenbeck → DH Manufacturing LLC → Lawsville Quarry**

- 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:** Nicholas Scott  Hawley → Lawsville Quarry; 2013-03-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nicholas S. Hawley → Lawsville Quarry; 2015-05-14 to 2022-01-02; source msha-controller-operator-history
- **controller_controls_operator:** Nicholas Scott  Hawley → Nicholas S. Hawley; 2015-05-14 to 2022-01-02; source msha-controller-operator-history
- **controller_controls_mine:** Devin  Hollenbeck → Lawsville Quarry; 2020-11-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** DH Manufacturing LLC → Lawsville Quarry; 2022-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Devin  Hollenbeck → DH Manufacturing LLC; 2022-01-03 to current/open; source msha-controller-operator-history