# Relationship history for MSHA mine 2700299

Current hierarchy: **Keith B  Foote → Big Foote Crushing LLC → Portable Unit #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:** C J Bolton Inc → Portable Unit #1; 1992-10-01 to 2004-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Christopher J  Bolton → Portable Unit #1; 1992-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christopher J  Bolton → C J Bolton Inc; 1992-10-01 to 2004-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Big Foote Crushing LLC → Portable Unit #1; 2004-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Keith B  Foote → Portable Unit #1; 2004-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keith B  Foote → Big Foote Crushing LLC; 2004-04-15 to current/open; source msha-controller-operator-history