# Relationship history for MSHA mine 4606603

Current hierarchy: **Smith Robert L → P S B Mining Company → Mine 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

- **controller_controls_mine:** Continental Resources & Mineral Corp → Mine No 1; 1975-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mc Namee Resources Inc → Mine No 1; 1982-11-01 to 1987-11-26; source msha-controller-operator-history
- **controller_controls_operator:** Continental Resources & Mineral Corp → Mc Namee Resources Inc; 1982-11-01 to 1987-11-26; source msha-controller-operator-history
- **operator_operates_mine:** Psb Mining Company → Mine No 1; 1987-11-27 to 1989-08-21; source msha-controller-operator-history
- **controller_controls_mine:** Paterino Charles E → Mine No 1; 1987-11-27 to 1989-08-21; source msha-controller-operator-history
- **controller_controls_operator:** Paterino Charles E → Psb Mining Company; 1987-11-27 to 1989-08-21; source msha-controller-operator-history
- **operator_operates_mine:** P S B Mining Company → Mine No 1; 1989-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Robert L → Mine No 1; 1989-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Robert L → P S B Mining Company; 1989-08-22 to current/open; source msha-controller-operator-history