# Relationship history for MSHA mine 4003257

Current hierarchy: **Kyle  Norwood → Norwood Construction, Inc. → North Benton**

- 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:** Norwood Construction, Inc. → North Benton; 2005-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kyle  Norwood et al → North Benton; 2005-03-31 to 2012-12-10; source msha-controller-operator-history
- **controller_controls_operator:** Kyle  Norwood et al → Norwood Construction, Inc.; 2005-03-31 to 2012-12-10; source msha-controller-operator-history
- **controller_controls_operator:** Joe  Cherry et al → Norwood Construction, Inc.; 2005-03-31 to 2012-12-10; source msha-controller-operator-history
- **controller_controls_mine:** Kyle  Norwood → North Benton; 2012-12-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kyle  Norwood → Norwood Construction, Inc.; 2012-12-11 to current/open; source msha-controller-operator-history