# Relationship history for MSHA mine 3100701

Current hierarchy: **Tarmac Plc → Tarmac Carolinas Inc → New Bern Sand Mine #2**

- 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:** Lone Star Industries Inc → New Bern Sand Mine #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** New Bern Building Supply Company → New Bern Sand Mine #2; 1950-01-01 to 1986-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Hines Mark S → New Bern Sand Mine #2; 1950-01-01 to 1986-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Hines Mark S → New Bern Building Supply Company; 1950-01-01 to 1986-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Lone Star Industries Inc → New Bern Sand Mine #2; 1986-08-18 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Lone Star Industries Inc → Lone Star Industries Inc; 1986-08-18 to 1986-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Tarmac-Lonestar Inc → New Bern Sand Mine #2; 1987-01-01 to 1988-12-18; source msha-controller-operator-history
- **controller_controls_mine:** Lone Star Industries Inc & Tarmac Plc → New Bern Sand Mine #2; 1987-01-01 to 1988-12-18; source msha-controller-operator-history
- **controller_controls_operator:** Lone Star Industries Inc & Tarmac Plc → Tarmac-Lonestar Inc; 1987-01-01 to 1988-12-18; source msha-controller-operator-history
- **operator_operates_mine:** Tarmac Carolinas Inc → New Bern Sand Mine #2; 1988-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tarmac Plc → New Bern Sand Mine #2; 1988-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tarmac Plc → Tarmac Carolinas Inc; 1988-12-19 to current/open; source msha-controller-operator-history