# Relationship history for MSHA mine 1001825

Current hierarchy: **Larry G  Boyer; Steve  Boyer → Boyer Gravel → Boyer 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:** Boyer Gravel → Boyer Pit; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Boyer et al → Boyer Pit; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Boyer et al → Boyer Gravel; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry G  Boyer et al → Boyer Gravel; 1988-05-01 to current/open; source msha-controller-operator-history