# Relationship history for MSHA mine 4104999

Current hierarchy: **Susan  Sparks → C W & A Inc → CW&A Inc**

- 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:** Susan  Sparks → CW&A Inc; 1981-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C W & A Inc → CW&A Inc; 2013-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Susan  Sparks → C W & A Inc; 2013-01-24 to current/open; source msha-controller-operator-history