# Relationship history for MSHA mine 1515340

Current hierarchy: **Boone Ready Mix; Capitol Development LLP; Hinkle Contracting Corp → 1820 Sand & Gravel LLC → 1820 Sand & Gravel LLC**

- 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:** Boone County Sand & Gravel Company Inc → 1820 Sand & Gravel LLC; 1985-08-01 to 1998-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Floyd  Ellis → 1820 Sand & Gravel LLC; 1985-08-01 to 1998-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Floyd  Ellis → Boone County Sand & Gravel Company Inc; 1985-08-01 to 1998-04-20; source msha-controller-operator-history
- **operator_operates_mine:** 1820 Sand & Gravel LLC → 1820 Sand & Gravel LLC; 1998-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Capitol Development LLP  et al → 1820 Sand & Gravel LLC; 1998-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Capitol Development LLP  et al → 1820 Sand & Gravel LLC; 1998-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boone Ready Mix et al → 1820 Sand & Gravel LLC; 1998-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hinkle Contracting Corp  et al → 1820 Sand & Gravel LLC; 1998-04-21 to current/open; source msha-controller-operator-history