# Relationship history for MSHA mine 4503806

Current hierarchy: **Robin  Chilton; Craig  Chilton → Chilton Logging Inc. → Portable 1**

- 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:** Chilton Logging Inc. → Portable 1; 2020-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Craig  Chilton et al → Portable 1; 2020-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig  Chilton et al → Chilton Logging Inc.; 2020-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robin  Chilton et al → Chilton Logging Inc.; 2020-08-26 to current/open; source msha-controller-operator-history