# Relationship history for MSHA mine 1500086

Current hierarchy: **Houchens Industries, Inc → Scotty's Contracting & Stone, LLC → Grayson County 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 County Quarry; 1950-01-01 to 1983-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Lawrence N  Harms → Grayson County Quarry; 1950-01-01 to 1983-01-25; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence N  Harms → Ragland Quarry Inc; 1950-01-01 to 1983-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Grayson County Stone Company → Grayson County Quarry; 1983-01-26 to 1989-03-19; source msha-controller-operator-history
- **controller_controls_mine:** Rogers Group Inc → Grayson County Quarry; 1983-01-26 to 1989-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Group Inc → Grayson County Stone Company; 1983-01-26 to 1989-03-19; source msha-controller-operator-history
- **controller_controls_mine:** James D  Scott → Grayson County Quarry; 1988-11-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Scotty'S Contracting & Stone Company → Grayson County Quarry; 1989-03-20 to 1999-12-31; source msha-controller-operator-history
- **controller_controls_operator:** James D  Scott → Scotty'S Contracting & Stone Company; 1989-03-20 to 1999-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Scotty's Contracting & Stone, LLC → Grayson County Quarry; 2000-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert K  Reynolds et al → Grayson County Quarry; 2000-01-01 to 2020-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Robert K  Reynolds et al → Scotty's Contracting & Stone, LLC; 2000-01-01 to 2020-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Houchens Industries, Inc → Grayson County 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