# Relationship history for MSHA mine 1201018

Current hierarchy: **PNR Holding → Phoenix Natural Resources → South 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:** P-V Corp → South Mine; 1950-01-01 to 1981-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Denis  Prechtel → South Mine; 1950-01-01 to 1981-02-12; source msha-controller-operator-history
- **controller_controls_operator:** Denis  Prechtel → P-V Corp; 1950-01-01 to 1981-02-12; source msha-controller-operator-history
- **operator_operates_mine:** P-V Mining Company Inc → South Mine; 1981-02-13 to 1991-12-31; source msha-controller-operator-history
- **controller_controls_mine:** MidAmerican Energy Holdings Company → South Mine; 1981-02-13 to 1991-12-31; source msha-controller-operator-history
- **controller_controls_operator:** MidAmerican Energy Holdings Company → P-V Mining Company Inc; 1981-02-13 to 1991-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Phoenix Natural Resources Inc → South Mine; 1992-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** PNR Holding → South Mine; 1992-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** PNR Holding → Phoenix Natural Resources Inc; 1992-01-01 to current/open; source msha-controller-operator-history