# Relationship history for MSHA mine 1002080

Current hierarchy: **Jeffrey L  Sagers → Bear Lake Stone, Inc. → Twin Creek Quarry**

- 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

- **controller_controls_mine:** Doug  Strate et al → Twin Creek Quarry; 2004-08-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southwest Stone → Twin Creek Quarry; 2005-09-29 to 2006-09-26; source msha-controller-operator-history
- **controller_controls_operator:** Doug  Strate et al → Southwest Stone; 2005-09-29 to 2006-09-26; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey L  Sagers et al → Southwest Stone; 2005-09-29 to 2006-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Bear Lake Stone, Inc. → Twin Creek Quarry; 2006-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey L  Sagers → Twin Creek Quarry; 2006-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey L  Sagers → Bear Lake Stone, Inc.; 2006-09-27 to current/open; source msha-controller-operator-history