# Relationship history for MSHA mine 0102956

Current hierarchy: **Vulcan Materials Company → VULCAN MATERIALS ASPHALT AND CONSTRUCTION, LLC → SPEEDWAY 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:** M B  McCartney → SPEEDWAY QUARRY; 1983-03-01 to 2018-03-09; source msha-controller-operator-history
- **operator_operates_mine:** McCartney Construction Co., Inc. → SPEEDWAY QUARRY; 1992-06-01 to 2021-06-30; source msha-controller-operator-history
- **controller_controls_operator:** M B  McCartney → McCartney Construction Co., Inc.; 1992-06-01 to 2018-03-09; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → SPEEDWAY QUARRY; 2018-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → McCartney Construction Co., Inc.; 2018-03-10 to 2021-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Materials Asphalt and Construction, LLC → SPEEDWAY QUARRY; 2021-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → SPEEDWAY QUARRY; 2021-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Materials Asphalt and Construction, LLC; 2021-07-01 to current/open; source msha-controller-operator-history