# Relationship history for MSHA mine 1515538

Current hierarchy: **Smith Robert L Jr & Henry Campbell → Dolittle Coal Company → 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Meeks Alvin E & Edgar Allen King → No 1 Mine; 1977-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K & M Coal Company Inc → No 1 Mine; 1986-03-01 to 1988-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Meeks Alvin E & Edgar Allen King → K & M Coal Company Inc; 1986-03-01 to 1988-06-19; source msha-controller-operator-history
- **operator_operates_mine:** J & W Coal Company → No 1 Mine; 1988-06-20 to 1988-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Anderson Jerry & Roy Goley → No 1 Mine; 1988-06-20 to 1988-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Anderson Jerry & Roy Goley → J & W Coal Company; 1988-06-20 to 1988-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Dolittle Coal Company → No 1 Mine; 1988-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Robert L Jr & Henry Campbell → No 1 Mine; 1988-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Robert L Jr & Henry Campbell → Dolittle Coal Company; 1988-08-15 to current/open; source msha-controller-operator-history