# Relationship history for MSHA mine 4605333

Current hierarchy: **White Mountain Mining Co., LLC → Shelby & Shelby 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:** Shelby & Shelby Coal Company → No 1 Mine; 1976-12-01 to 1977-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Dillon John & Kenneth Cline → No 1 Mine; 1976-12-01 to 1977-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Dillon John & Kenneth Cline → Shelby & Shelby Coal Company; 1976-12-01 to 1977-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Shelby & Shelby Coal Company → No 1 Mine; 1977-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** White Mountain Mining Co., LLC → No 1 Mine; 1977-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** White Mountain Mining Co., LLC → Shelby & Shelby Coal Company; 1977-11-15 to current/open; source msha-controller-operator-history