# Relationship history for MSHA mine 4607146

Current hierarchy: **Robertson Jack → Paybra Mining Company Inc → Mine No 4**

- 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:** Robertson Jack → Mine No 4; 1985-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ru-Mae Mining Inc → Mine No 4; 1986-06-01 to 1989-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Phillips Robert L → Mine No 4; 1986-06-01 to 1989-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Phillips Robert L → Ru-Mae Mining Inc; 1986-06-01 to 1989-02-02; source msha-controller-operator-history
- **operator_operates_mine:** D D & L Coal Company Inc → Mine No 4; 1989-02-03 to 1990-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Morgan Rush Glenn → Mine No 4; 1989-02-03 to 1990-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Morgan Rush Glenn → D D & L Coal Company Inc; 1989-02-03 to 1990-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Paybra Mining Company Inc → Mine No 4; 1990-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robertson Jack → Paybra Mining Company Inc; 1990-11-14 to current/open; source msha-controller-operator-history