# Relationship history for MSHA mine 1401718

Current hierarchy: **Curtis D  Whitaker → Whitaker Aggregates 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Curtis D  Whitaker et al → Portable Plant #2; 2005-07-30 to 2013-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Whitaker Aggregates Inc → Portable Plant #2; 2010-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Curtis D  Whitaker et al → Whitaker Aggregates Inc; 2010-06-16 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Sandra K  Whitaker et al → Whitaker Aggregates Inc; 2010-06-16 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Curtis D  Whitaker → Portable Plant #2; 2014-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Curtis D  Whitaker → Whitaker Aggregates Inc; 2014-01-01 to current/open; source msha-controller-operator-history