# Relationship history for MSHA mine 3608981

Current hierarchy: **Brian K  Short → Short Brothers Inc → Short Bros I**

- 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:** Short Brothers Inc → Short Bros I; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brian K  Short et al → Short Bros I; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian K  Short et al → Short Brothers Inc; 2001-04-01 to current/open; source msha-controller-operator-history