# Relationship history for MSHA mine 1401577

Current hierarchy: **Curtis D  Whitaker → Whitaker Aggregates → Winfield Quarry**

- 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:** Martin Marietta Materials Inc → Winfield Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Service Mining Corp → Winfield Quarry; 1994-02-01 to 1996-12-08; source msha-controller-operator-history
- **controller_controls_mine:** Larry L  Stewart et al → Winfield Quarry; 1994-02-01 to 1996-12-08; source msha-controller-operator-history
- **controller_controls_operator:** Larry L  Stewart et al → Service Mining Corp; 1994-02-01 to 1996-12-08; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → Winfield Quarry; 1996-12-09 to 2006-02-13; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1996-12-09 to 2006-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Sandra K  Whitaker et al → Winfield Quarry; 2005-07-30 to 2013-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Whitaker Aggregates → Winfield Quarry; 2006-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sandra K  Whitaker et al → Whitaker Aggregates; 2006-02-14 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Curtis D  Whitaker et al → Whitaker Aggregates; 2006-02-14 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Curtis D  Whitaker → Winfield Quarry; 2014-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Curtis D  Whitaker → Whitaker Aggregates; 2014-01-01 to current/open; source msha-controller-operator-history