# Relationship history for MSHA mine 0800182

Current hierarchy: **Agrifos L L C → Agrifos Mining Llc → NICHOLS PREP**

- 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:** Mobil Mining & Minerals Company → NICHOLS PREP; 1950-01-01 to 1996-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Mobil Corp → NICHOLS PREP; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mobil Corp → Mobil Mining & Minerals Company; 1950-01-01 to 1996-04-07; source msha-controller-operator-history
- **operator_operates_mine:** Agrifos Mining Llc → NICHOLS PREP; 1996-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Agrifos L L C → NICHOLS PREP; 1996-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Agrifos L L C → Agrifos Mining Llc; 1996-04-08 to current/open; source msha-controller-operator-history