# Relationship history for MSHA mine 2302172

Current hierarchy: **Philip S Myers; Donna S Myers → Bluffton Quarry → Bluffton 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

- **operator_operates_mine:** Missouri Valley Materials Inc → Bluffton Quarry; 1998-06-01 to 2004-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Vernaci Joseph A → Bluffton Quarry; 1998-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vernaci Joseph A → Missouri Valley Materials Inc; 1998-06-01 to 2004-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Missouri Valley Materials Inc → Bluffton Quarry; 2004-05-15 to 2007-12-12; source msha-controller-operator-history
- **controller_controls_mine:** Brian C  Lensing → Bluffton Quarry; 2004-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian C  Lensing → Missouri Valley Materials Inc; 2004-05-15 to 2007-12-12; source msha-controller-operator-history
- **operator_operates_mine:** Siegfried Real Estate Holdings LLC → Bluffton Quarry; 2007-12-13 to 2010-05-11; source msha-controller-operator-history
- **controller_controls_mine:** S Carl  Lensing → Bluffton Quarry; 2007-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S Carl  Lensing → Siegfried Real Estate Holdings LLC; 2007-12-13 to 2010-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Bluffton Stone LLC → Bluffton Quarry; 2010-05-12 to 2013-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Susanne R  Bader → Bluffton Quarry; 2010-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Susanne R  Bader → Bluffton Stone LLC; 2010-05-12 to 2013-06-04; source msha-controller-operator-history
- **operator_operates_mine:** Bluffton Quarry → Bluffton Quarry; 2013-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Philip S Myers et al → Bluffton Quarry; 2013-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Philip S Myers et al → Bluffton Quarry; 2013-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donna S Myers et al → Bluffton Quarry; 2013-06-05 to current/open; source msha-controller-operator-history