# Relationship history for MSHA mine 3003560

Current hierarchy: **Leo G  Doyle → Bryant Mine Sand & Gravel → Bryant Mine**

- 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:** Bryant Mine Sand & Gravel → Bryant Mine; 2006-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Leo G  Doyle → Bryant Mine; 2006-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leo G  Doyle → Bryant Mine Sand & Gravel; 2006-08-21 to current/open; source msha-controller-operator-history