# Relationship history for MSHA mine 0405372

Current hierarchy: **Robert J  Hammett → Dunstone Rock Quarry → Dunstone Rock 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:** Mike P  Bauman → Dunstone Rock Quarry; 1994-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bauman Landscape Inc. → Dunstone Rock Quarry; 1999-06-01 to 2006-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Mike P  Bauman → Bauman Landscape Inc.; 1999-06-01 to 2006-02-28; source msha-controller-operator-history
- **operator_operates_mine:** McGuire and Hester → Dunstone Rock Quarry; 2006-03-01 to 2010-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Mike R  Hester → Dunstone Rock Quarry; 2006-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike R  Hester → McGuire and Hester; 2006-03-01 to 2010-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Dunstone Rock Quarry → Dunstone Rock Quarry; 2010-07-01 to 2013-06-27; source msha-controller-operator-history
- **controller_controls_mine:** Robert G  Hammett → Dunstone Rock Quarry; 2010-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert G  Hammett → Dunstone Rock Quarry; 2010-07-01 to 2013-06-27; source msha-controller-operator-history
- **operator_operates_mine:** Dunstone Rock Quarry → Dunstone Rock Quarry; 2013-06-28 to 2019-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Joyce S.  Hammett → Dunstone Rock Quarry; 2013-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joyce S.  Hammett → Dunstone Rock Quarry; 2013-06-28 to 2019-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Dunstone Rock Quarry → Dunstone Rock Quarry; 2019-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert J  Hammett → Dunstone Rock Quarry; 2019-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert J  Hammett → Dunstone Rock Quarry; 2019-02-13 to current/open; source msha-controller-operator-history