# Relationship history for MSHA mine 1401475

Current hierarchy: **Curtis D  Whitaker → Whitaker Companies Inc → Portable Plant #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

- **controller_controls_mine:** Billy D  McAdam → Portable Plant #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hunt Midwest Enterprises → Portable Plant #1; 1985-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mc Adam Construction Company Inc → Portable Plant #1; 1985-07-01 to 1996-05-12; source msha-controller-operator-history
- **controller_controls_operator:** Billy D  McAdam → Mc Adam Construction Company Inc; 1985-07-01 to 1996-05-12; source msha-controller-operator-history
- **operator_operates_mine:** Hunt Midwest Mining Inc → Portable Plant #1; 1996-05-13 to 2006-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Hunt Midwest Enterprises → Hunt Midwest Mining Inc; 1996-05-13 to 2006-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Whitaker Companies Inc → Portable Plant #1; 2006-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sandra K  Whitaker et al → Portable Plant #1; 2006-04-03 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Sandra K  Whitaker et al → Whitaker Companies Inc; 2006-04-03 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Curtis D  Whitaker et al → Whitaker Companies Inc; 2006-04-03 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Curtis D  Whitaker → Portable Plant #1; 2014-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Curtis D  Whitaker → Whitaker Companies Inc; 2014-01-01 to current/open; source msha-controller-operator-history