# Relationship history for MSHA mine 4202435

Current hierarchy: **Brett  Bryson; Peter  Gordon → Wasatch Gravel and Rock, LLP → Elberta**

- 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:** Wasatch Mountain Excavating → Elberta; 2006-04-13 to 2008-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Brett  Bryson → Elberta; 2006-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brett  Bryson → Wasatch Mountain Excavating; 2006-04-13 to 2008-07-16; source msha-controller-operator-history
- **operator_operates_mine:** Wasatch Rock & Gravel, LLP → Elberta; 2008-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Peter  Gordon et al → Elberta; 2008-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter  Gordon et al → Wasatch Rock & Gravel, LLP; 2008-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brett  Bryson et al → Wasatch Rock & Gravel, LLP; 2008-07-17 to current/open; source msha-controller-operator-history