# Relationship history for MSHA mine 0504548

Current hierarchy: **John  Palider → J P Materials → Ary Airport 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:** J P Materials → Ary Airport Pit; 1994-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Palider → Ary Airport Pit; 1994-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Palider → J P Materials; 1994-07-01 to current/open; source msha-controller-operator-history