# Relationship history for MSHA mine 1518137

Current hierarchy: **Houchens Industries, Inc → Scotty's Contracting & Stone, LLC → GRAYSON CO. - RAGLAND 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Ragland Quarry Inc → GRAYSON CO. - RAGLAND QUARRY; 1999-02-01 to 2007-10-04; source msha-controller-operator-history
- **controller_controls_mine:** Ray  Ragland → GRAYSON CO. - RAGLAND QUARRY; 1999-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray  Ragland → Ragland Quarry Inc; 1999-02-01 to 2007-10-04; source msha-controller-operator-history
- **controller_controls_mine:** Robert K  Reynolds et al → GRAYSON CO. - RAGLAND QUARRY; 2000-01-01 to 2020-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Scotty's Contracting & Stone, LLC → GRAYSON CO. - RAGLAND QUARRY; 2007-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert K  Reynolds et al → Scotty's Contracting & Stone, LLC; 2007-10-05 to 2020-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Houchens Industries, Inc → GRAYSON CO. - RAGLAND QUARRY; 2020-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Houchens Industries, Inc → Scotty's Contracting & Stone, LLC; 2020-07-10 to current/open; source msha-controller-operator-history