# Relationship history for MSHA mine 3608996

Current hierarchy: **Kevin  Casselbury; Frederick  Tyson → F & K Stone → BROOKDALE #2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** F & K Stone → BROOKDALE #2; 2001-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frederick  Tyson  et al → BROOKDALE #2; 2001-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frederick  Tyson  et al → F & K Stone; 2001-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Casselbury  et al → F & K Stone; 2001-06-01 to current/open; source msha-controller-operator-history