# Relationship history for MSHA mine 3200957

Current hierarchy: **Russell Lester  Becker → BCI Construction → extec#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

- **operator_operates_mine:** BCI Construction → extec#1; 2012-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Russell Lester  Becker → extec#1; 2012-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Russell Lester  Becker → BCI Construction; 2012-12-04 to current/open; source msha-controller-operator-history