# Relationship history for MSHA mine 3200765

Current hierarchy: **Diane M Close → Close Construction Company Inc → Portable Plant #5**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Greg J  Close  et al → Portable Plant #5; 1981-04-01 to 2023-04-24; source msha-controller-operator-history
- **operator_operates_mine:** Close Construction Company Inc → Portable Plant #5; 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greg J  Close  et al → Close Construction Company Inc; 1998-07-01 to 2023-04-24; source msha-controller-operator-history
- **controller_controls_operator:** Diane M  Close  et al → Close Construction Company Inc; 1998-07-01 to 2023-04-24; source msha-controller-operator-history
- **controller_controls_mine:** Diane M Close → Portable Plant #5; 2023-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Diane M Close → Close Construction Company Inc; 2023-04-25 to current/open; source msha-controller-operator-history