# Relationship history for MSHA mine 1201770

Current hierarchy: **PNR Holding → Phoenix Natural Resources Inc → Midway Tipple**

- 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:** Eiteljorg Harrison & Roger--Kenneth Gerrard → Midway Tipple; 1979-03-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Central Utility Coal Company Inc → Midway Tipple; 1980-03-01 to 1982-06-07; source msha-controller-operator-history
- **controller_controls_operator:** Eiteljorg Harrison & Roger--Kenneth Gerrard → Central Utility Coal Company Inc; 1980-03-01 to 1982-06-07; source msha-controller-operator-history
- **operator_operates_mine:** Associates Mining Company → Midway Tipple; 1982-06-08 to 1991-12-31; source msha-controller-operator-history
- **controller_controls_mine:** MidAmerican Energy Holdings Company → Midway Tipple; 1982-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MidAmerican Energy Holdings Company → Associates Mining Company; 1982-06-08 to 1991-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Phoenix Natural Resources Inc → Midway Tipple; 1992-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** PNR Holding → Midway Tipple; 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