# Relationship history for MSHA mine 4001589

Current hierarchy: **Davis & Mays Coal Co → Davis & Mays 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Dixie Mining Company → No 1 Mine; 1974-01-01 to 1974-10-30; source msha-controller-operator-history
- **controller_controls_mine:** Dixie Mining Co → No 1 Mine; 1974-01-01 to 1974-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Dixie Mining Co → Dixie Mining Company; 1974-01-01 to 1974-10-30; source msha-controller-operator-history
- **operator_operates_mine:** Farmer & Garland Coal Company → No 1 Mine; 1974-11-01 to 1975-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Farmer & Garland Coal Co → No 1 Mine; 1974-11-01 to 1975-07-23; source msha-controller-operator-history
- **controller_controls_operator:** Farmer & Garland Coal Co → Farmer & Garland Coal Company; 1974-11-01 to 1975-07-23; source msha-controller-operator-history
- **operator_operates_mine:** Davis & Mays Coal Company → No 1 Mine; 1975-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Davis & Mays Coal Co → No 1 Mine; 1975-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davis & Mays Coal Co → Davis & Mays Coal Company; 1975-07-24 to current/open; source msha-controller-operator-history