# Relationship history for MSHA mine 1508791

Current hierarchy: **Saylor Byrd → Leslie & Harlan Coal Corp → No 1 Mine**

- 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:** Kenna Enterprises Inc → No 1 Mine; 1975-09-01 to 1976-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Maggard Hershel → No 1 Mine; 1975-09-01 to 1976-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Maggard Hershel → Kenna Enterprises Inc; 1975-09-01 to 1976-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Carmicol Coal Company Inc → No 1 Mine; 1976-08-23 to 1976-12-19; source msha-controller-operator-history
- **controller_controls_mine:** Carmicol Harold → No 1 Mine; 1976-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carmicol Harold → Carmicol Coal Company Inc; 1976-08-23 to 1976-12-19; source msha-controller-operator-history
- **operator_operates_mine:** Leslie & Harlan Coal Corp → No 1 Mine; 1976-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Saylor Byrd → No 1 Mine; 1976-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Saylor Byrd → Leslie & Harlan Coal Corp; 1976-12-20 to current/open; source msha-controller-operator-history