# Relationship history for MSHA mine 4703545

Current hierarchy: **Daniel C  Ivey; Chase C  Ivey → Ivey Construction Inc → Portable Plant #2**

- 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

- **controller_controls_mine:** Dan C  Ivey et al → Portable Plant #2; 1950-01-01 to 2020-10-27; source msha-controller-operator-history
- **operator_operates_mine:** Ivey Construction Inc → Portable Plant #2; 2008-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dan C  Ivey et al → Ivey Construction Inc; 2008-09-10 to 2020-10-27; source msha-controller-operator-history
- **controller_controls_operator:** Bruce P  Ivey et al → Ivey Construction Inc; 2008-09-10 to 2020-10-27; source msha-controller-operator-history
- **controller_controls_mine:** Daniel C  Ivey et al → Portable Plant #2; 2020-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel C  Ivey et al → Ivey Construction Inc; 2020-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chase C  Ivey et al → Ivey Construction Inc; 2020-10-28 to current/open; source msha-controller-operator-history