# Relationship history for MSHA mine 3301705

Current hierarchy: **Amy  Demmy → Demmy Sand & Gravel → Demmy 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:** Demmy Sand & Gravel → Demmy Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Woodrow  Demmy → Demmy Sand & Gravel; 1950-01-01 to 2007-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Woodrow  Demmy → Demmy Sand & Gravel; 1950-01-01 to 2007-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Daniel E  Demmy → Demmy Sand & Gravel; 2007-10-15 to 2009-12-28; source msha-controller-operator-history
- **controller_controls_operator:** Daniel E  Demmy → Demmy Sand & Gravel; 2007-10-15 to 2009-12-28; source msha-controller-operator-history
- **controller_controls_mine:** Amy  Demmy → Demmy Sand & Gravel; 2009-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amy  Demmy → Demmy Sand & Gravel; 2009-12-29 to current/open; source msha-controller-operator-history