# Relationship history for MSHA mine 1500068

Current hierarchy: **Houchens Industries, Inc → Scotty'S Contracting & Stone Llc → METCALFE CO. 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:** Montgomery & Company → METCALFE CO. QUARRY; 1950-01-01 to 1997-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Simeon  Montgomery → METCALFE CO. QUARRY; 1950-01-01 to 1997-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Simeon  Montgomery → Montgomery & Company; 1950-01-01 to 1997-03-31; source msha-controller-operator-history
- **controller_controls_mine:** James D  Scott → METCALFE CO. QUARRY; 1988-11-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Scotty'S Contracting & Stone Company → METCALFE CO. QUARRY; 1997-04-01 to 2000-08-16; source msha-controller-operator-history
- **controller_controls_operator:** James D  Scott → Scotty'S Contracting & Stone Company; 1997-04-01 to 2000-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Robert K  Reynolds et al → METCALFE CO. QUARRY; 2000-01-01 to 2020-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Scotty'S Contracting & Stone Llc → METCALFE CO. QUARRY; 2000-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert K  Reynolds et al → Scotty'S Contracting & Stone Llc; 2000-08-17 to 2020-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Houchens Industries, Inc → METCALFE CO. 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