# Relationship history for MSHA mine 4202167

Current hierarchy: **Estate of Randy Tomaiko; Ed  Burgess → Quality Excavation → Desert Canyon Pit**

- 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:** G O Bundy Construction → Desert Canyon Pit; 1997-02-01 to 2002-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Glen  Bundy → Desert Canyon Pit; 1997-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glen  Bundy → G O Bundy Construction; 1997-02-01 to 2002-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Ed  Burgess et al → Desert Canyon Pit; 2000-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Quality Excavation → Desert Canyon Pit; 2002-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ed  Burgess et al → Quality Excavation; 2002-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Estate of Randy Tomaiko et al → Quality Excavation; 2002-12-10 to current/open; source msha-controller-operator-history