# Relationship history for MSHA mine 3402119

Current hierarchy: **Patricia  Melton → OK Rock Quarries LLC → Knox**

- 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:** Patricia  Melton → Knox; 2006-05-18 to 2010-09-30; source msha-controller-operator-history
- **controller_controls_mine:** David E  Baker → Knox; 2010-10-01 to 2022-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Mayhall Stone → Knox; 2011-06-30 to 2011-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Gary W  Mayhall et al → Knox; 2011-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary W  Mayhall et al → Mayhall Stone; 2011-06-30 to 2011-07-21; source msha-controller-operator-history
- **operator_operates_mine:** G & B Stone LLC → Knox; 2011-07-22 to 2014-02-17; source msha-controller-operator-history
- **controller_controls_mine:** Gary W  Mayhall et al → Knox; 2011-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary W  Mayhall et al → G & B Stone LLC; 2011-07-22 to 2014-02-17; source msha-controller-operator-history
- **operator_operates_mine:** OK Rock Quarries LLC → Knox; 2014-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patricia  Melton → OK Rock Quarries LLC; 2014-02-18 to 2010-09-30; source msha-controller-operator-history
- **controller_controls_operator:** David E  Baker → OK Rock Quarries LLC; 2014-02-18 to 2022-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Patricia  Melton → Knox; 2022-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patricia  Melton → OK Rock Quarries LLC; 2022-06-15 to current/open; source msha-controller-operator-history