# Relationship history for MSHA mine 0405872

Current hierarchy: **John  Bremer; Brady  Barto → US Mine Corp → Sierra Lady Site 1**

- 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:** A Scott  Dockter → Sierra Lady Site 1; 2013-03-04 to 2025-06-17; source msha-controller-operator-history
- **operator_operates_mine:** US Mine Corp → Sierra Lady Site 1; 2013-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A Scott  Dockter → US Mine Corp; 2013-09-27 to 2025-06-17; source msha-controller-operator-history
- **controller_controls_mine:** John  Bremer et al → Sierra Lady Site 1; 2025-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Bremer et al → US Mine Corp; 2025-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brady  Barto et al → US Mine Corp; 2025-06-18 to current/open; source msha-controller-operator-history