# Relationship history for MSHA mine 1200115

Current hierarchy: **Kenneth T  Wanstrath → New Point Stone Company Inc → St Paul Stone Company**

- 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:** Kenneth T  Wanstrath et al → St Paul Stone Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** St Paul Quarries Inc → St Paul Stone Company; 1950-01-01 to 1982-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Cumberland Quarries Inc → St Paul Stone Company; 1950-01-01 to 1982-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Cumberland Quarries Inc → St Paul Quarries Inc; 1950-01-01 to 1982-11-07; source msha-controller-operator-history
- **operator_operates_mine:** New Point Stone Company Inc → St Paul Stone Company; 1982-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth T  Wanstrath et al → New Point Stone Company Inc; 1982-11-08 to current/open; source msha-controller-operator-history