# Relationship history for MSHA mine 2103721

Current hierarchy: **Bryce  Butcher; Amber  Butcher → Emily Sand & Gravel → Emily Sand & Gravel**

- 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:** Emily Sand & Gravel → Emily Sand & Gravel; 2010-09-22 to 2015-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Clarence (Andy)  Anderson → Emily Sand & Gravel; 2010-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clarence (Andy)  Anderson → Emily Sand & Gravel; 2010-09-22 to 2015-06-24; source msha-controller-operator-history
- **operator_operates_mine:** Emily Sand & Gravel → Emily Sand & Gravel; 2015-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Amber  Butcher et al → Emily Sand & Gravel; 2015-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amber  Butcher et al → Emily Sand & Gravel; 2015-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryce  Butcher et al → Emily Sand & Gravel; 2015-06-25 to current/open; source msha-controller-operator-history