# Relationship history for MSHA mine 4105558

Current hierarchy: **David J  Dalrymple → Dalrymple Gravel & Contracting Co., Inc. → Highway 173 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Dalrymple Holding Corp → Highway 173 Quarry; 1950-01-01 to 2014-10-17; source msha-controller-operator-history
- **controller_controls_mine:** David J  Dalrymple → Highway 173 Quarry; 2014-10-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dalrymple Gravel & Contracting Co., Inc. → Highway 173 Quarry; 2021-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David J  Dalrymple → Dalrymple Gravel & Contracting Co., Inc.; 2021-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dalrymple Holding Corp → Dalrymple Gravel & Contracting Co., Inc.; 2021-03-15 to 2014-10-17; source msha-controller-operator-history