# Relationship history for MSHA mine 4604627

Current hierarchy: **Daugherty James R → D & D Mining Company Inc → No 1**

- 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:** Wyoming Coal Mining Company → No 1; 1950-01-01 to 1977-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Carroll Preston W → No 1; 1950-01-01 to 1977-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Carroll Preston W → Wyoming Coal Mining Company; 1950-01-01 to 1977-01-05; source msha-controller-operator-history
- **operator_operates_mine:** E & H Mining & Trucking Inc → No 1; 1977-01-06 to 1987-02-01; source msha-controller-operator-history
- **controller_controls_mine:** Larry A  Lough et al → No 1; 1977-01-06 to 1987-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Larry A  Lough et al → E & H Mining & Trucking Inc; 1977-01-06 to 1987-02-01; source msha-controller-operator-history
- **operator_operates_mine:** D & D Mining Company Inc → No 1; 1987-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daugherty James R → No 1; 1987-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daugherty James R → D & D Mining Company Inc; 1987-02-02 to current/open; source msha-controller-operator-history