# Relationship history for MSHA mine 4405196

Current hierarchy: **Mary Schreiber  Cox → Custom Concrete → Nice Properties Co Pit 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Nice Henry R → Nice Properties Co Pit 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nice Properties Company → Nice Properties Co Pit 2; 1979-01-01 to 1984-08-15; source msha-controller-operator-history
- **controller_controls_operator:** Nice Henry R → Nice Properties Company; 1979-01-01 to 1984-08-15; source msha-controller-operator-history
- **operator_operates_mine:** Custom Concrete → Nice Properties Co Pit 2; 1984-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mary Schreiber  Cox  et al → Nice Properties Co Pit 2; 1984-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mary Schreiber  Cox  et al → Custom Concrete; 1984-08-16 to current/open; source msha-controller-operator-history