# Relationship history for MSHA mine 4202168

Current hierarchy: **Troy L  Allen → Allen Rock Products → Allen 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:** Allen Rock Products → Allen Pit; 1997-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Troy L  Allen  et al → Allen Pit; 1997-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Troy L  Allen  et al → Allen Rock Products; 1997-03-01 to current/open; source msha-controller-operator-history