# Relationship history for MSHA mine 0201143

Current hierarchy: **Harry  Hancock → Phillips Redi-Mix → COTTONWOOD WASH SAND & GRAVEL PI**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** K H Phillips & Company → COTTONWOOD WASH SAND & GRAVEL PI; 1950-01-01 to 1985-10-28; source msha-controller-operator-history
- **controller_controls_mine:** K H  Phillips → COTTONWOOD WASH SAND & GRAVEL PI; 1950-01-01 to 1985-10-28; source msha-controller-operator-history
- **controller_controls_operator:** K H  Phillips → K H Phillips & Company; 1950-01-01 to 1985-10-28; source msha-controller-operator-history
- **operator_operates_mine:** Phillips Redi-Mix → COTTONWOOD WASH SAND & GRAVEL PI; 1985-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harry  Hancock → COTTONWOOD WASH SAND & GRAVEL PI; 1985-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harry  Hancock → Phillips Redi-Mix; 1985-10-29 to current/open; source msha-controller-operator-history