# Relationship history for MSHA mine 2500413

Current hierarchy: **Larry  Paulsen → Paulsen Inc → Ogallala Pit**

- 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:** Armour Sand & Gravel → Ogallala Pit; 1950-01-01 to 1995-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Calvin  Armour → Ogallala Pit; 1950-01-01 to 1995-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Calvin  Armour → Armour Sand & Gravel; 1950-01-01 to 1995-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Paulsen et al → Ogallala Pit; 1993-01-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Paulsen Inc → Ogallala Pit; 1996-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Paulsen et al → Paulsen Inc; 1996-01-01 to current/open; source msha-controller-operator-history