# Relationship history for MSHA mine 3101526

Current hierarchy: **Boxley Materials Co → Boxley Aggregates Of NC Inc → Boxley Aggregates-Pine Hall**

- 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

- **operator_operates_mine:** B & R Sand Company → Boxley Aggregates-Pine Hall; 1950-01-01 to 1994-10-13; source msha-controller-operator-history
- **controller_controls_mine:** Thomas W  Robertson  et al → Boxley Aggregates-Pine Hall; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas W  Robertson  et al → B & R Sand Company; 1950-01-01 to 1994-10-13; source msha-controller-operator-history
- **controller_controls_mine:** C N  Eanes → Boxley Aggregates-Pine Hall; 1985-04-01 to 1998-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Eden Sand Company → Boxley Aggregates-Pine Hall; 1994-10-14 to 1998-03-31; source msha-controller-operator-history
- **controller_controls_operator:** C N  Eanes → Eden Sand Company; 1994-10-14 to 1998-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Boxley Aggregates Of NC Inc → Boxley Aggregates-Pine Hall; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Boxley Materials Co → Boxley Aggregates-Pine Hall; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boxley Materials Co → Boxley Aggregates Of NC Inc; 1998-04-01 to current/open; source msha-controller-operator-history