# Relationship history for MSHA mine 4002034

Current hierarchy: **Macgas V Inc; Moore Mc Cormack Cement Inc → Dixie Cement Company Inc → Kingsport Cement Mill**

- 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

- **operator_operates_mine:** Penn-Dixie Industries Inc → Kingsport Cement Mill; 1950-01-01 to 1981-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Penn-Dixie Industries Inc → Kingsport Cement Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Penn-Dixie Industries Inc → Penn-Dixie Industries Inc; 1950-01-01 to 1981-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Moore Mc Cormack Cement Inc  et al → Kingsport Cement Mill; 1981-02-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dixie Cement Company Inc → Kingsport Cement Mill; 1981-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moore Mc Cormack Cement Inc  et al → Dixie Cement Company Inc; 1981-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Macgas V Inc  et al → Dixie Cement Company Inc; 1981-04-28 to current/open; source msha-controller-operator-history