# Relationship history for MSHA mine 4606980

Current hierarchy: **Minnix Kenneth L → Mattmanda Coal Company Inc → Pioneer 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Paybra Mining Company Inc → Pioneer No 1 Mine; 1985-08-01 to 1987-05-10; source msha-controller-operator-history
- **controller_controls_mine:** Robertson Jack → Pioneer No 1 Mine; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robertson Jack → Paybra Mining Company Inc; 1985-08-01 to 1987-05-10; source msha-controller-operator-history
- **controller_controls_mine:** Minnix Kenneth L → Pioneer No 1 Mine; 1986-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mattmanda Coal Company Inc → Pioneer No 1 Mine; 1987-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Minnix Kenneth L → Mattmanda Coal Company Inc; 1987-05-11 to current/open; source msha-controller-operator-history