# Relationship history for MSHA mine 3003329

Current hierarchy: **Peter L  Krog → Krog Corporation → Savona Gravel LLC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Laverne  Billings → Savona Gravel LLC; 1985-05-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R C Billings Inc → Savona Gravel LLC; 2000-05-01 to 2002-07-01; source msha-controller-operator-history
- **controller_controls_operator:** Laverne  Billings → R C Billings Inc; 2000-05-01 to 2002-07-01; source msha-controller-operator-history
- **controller_controls_mine:** Andrew J  Dickson et al → Savona Gravel LLC; 2001-06-25 to 2016-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Knight Settlement Sand & Gravel LLC → Savona Gravel LLC; 2002-07-02 to 2009-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Andrew J  Dickson et al → Knight Settlement Sand & Gravel LLC; 2002-07-02 to 2009-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Bryan S  Dickson et al → Knight Settlement Sand & Gravel LLC; 2002-07-02 to 2009-05-19; source msha-controller-operator-history
- **operator_operates_mine:** Krog Corporation → Savona Gravel LLC; 2009-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Peter L  Krog → Savona Gravel LLC; 2009-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter L  Krog → Krog Corporation; 2009-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bryan S  Dickson et al → Savona Gravel LLC; 2016-06-01 to 2022-08-29; source msha-controller-operator-history
- **controller_controls_operator:** Bryan S  Dickson et al → Knight Settlement Sand & Gravel LLC; 2016-06-01 to 2009-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Leland J  Dickson et al → Knight Settlement Sand & Gravel LLC; 2016-06-01 to 2009-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Bryan S Dickson → Savona Gravel LLC; 2022-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryan S Dickson → Knight Settlement Sand & Gravel LLC; 2022-08-30 to 2009-05-19; source msha-controller-operator-history