# Relationship history for MSHA mine 4202461

Current hierarchy: **Tony J Jackson; Terry Kirk Jackson → Bullhead Sand & Gravel, Inc. → Bullhead Sand & Gravel, Inc.**

- 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

- **operator_operates_mine:** Jackson Excavation, Inc. → Bullhead Sand & Gravel, Inc.; 2007-04-17 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Terry Kirk Jackson et al → Bullhead Sand & Gravel, Inc.; 2007-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry Kirk Jackson et al → Jackson Excavation, Inc.; 2007-04-17 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Tony J Jackson et al → Jackson Excavation, Inc.; 2007-04-17 to 2014-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Bullhead Sand & Gravel, Inc. → Bullhead Sand & Gravel, Inc.; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Amy J  Jackson et al → Bullhead Sand & Gravel, Inc.; 2015-01-01 to 2019-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Amy J  Jackson et al → Bullhead Sand & Gravel, Inc.; 2015-01-01 to 2019-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Terrance C  Jackson et al → Bullhead Sand & Gravel, Inc.; 2015-01-01 to 2019-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Amy J  Jackson et al → Bullhead Sand & Gravel, Inc.; 2019-01-02 to 2025-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Amy J  Jackson et al → Bullhead Sand & Gravel, Inc.; 2019-01-02 to 2025-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Kelley C  Jackson et al → Bullhead Sand & Gravel, Inc.; 2019-01-02 to 2025-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Terry Kirk Jackson et al → Bullhead Sand & Gravel, Inc.; 2025-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry Kirk Jackson et al → Bullhead Sand & Gravel, Inc.; 2025-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tony J Jackson et al → Bullhead Sand & Gravel, Inc.; 2025-08-05 to current/open; source msha-controller-operator-history