# Relationship history for MSHA mine 4801621

Current hierarchy: **Jim  Rice; Jeff  Kilroy → Rice-Kilroy Construction Company Inc. → Atlantic City Screen**

- 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:** Rice-Kilroy Construction Company Inc. → Atlantic City Screen; 2002-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jeff  Kilroy et al → Atlantic City Screen; 2002-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Kilroy et al → Rice-Kilroy Construction Company Inc.; 2002-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jim  Rice et al → Rice-Kilroy Construction Company Inc.; 2002-05-17 to current/open; source msha-controller-operator-history