# Relationship history for MSHA mine 3100564

Current hierarchy: **Vulcan Materials Company → Wake Stone Corp → KNIGHTDALE 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:** John R.  Bratton et al → KNIGHTDALE QUARRY; 1950-01-01 to 2024-11-07; source msha-controller-operator-history
- **operator_operates_mine:** Wake Stone Corp → KNIGHTDALE QUARRY; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R.  Bratton et al → Wake Stone Corp; 1978-03-09 to 2024-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → KNIGHTDALE QUARRY; 2024-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Wake Stone Corp; 2024-11-08 to current/open; source msha-controller-operator-history