# Relationship history for MSHA mine 2800747

Current hierarchy: **James D  Morrissey III → Ward Sand & Materials Company → WARD SAND & MATERIALS CO.**

- 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:** James D  Morrissey Jr → WARD SAND & MATERIALS CO.; 1950-01-01 to 2025-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Lockhart Sand Company → WARD SAND & MATERIALS CO.; 1950-01-01 to 1980-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Liberty Corp → WARD SAND & MATERIALS CO.; 1950-01-01 to 1980-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Liberty Corp → Lockhart Sand Company; 1950-01-01 to 1980-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Ward Sand & Materials Company → WARD SAND & MATERIALS CO.; 1980-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James D  Morrissey Jr → Ward Sand & Materials Company; 1980-05-01 to 2025-10-15; source msha-controller-operator-history
- **controller_controls_mine:** James D  Morrissey III → WARD SAND & MATERIALS CO.; 2025-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James D  Morrissey III → Ward Sand & Materials Company; 2025-10-16 to current/open; source msha-controller-operator-history