# Relationship history for MSHA mine 2900494

Current hierarchy: **Paul  Wood → W W C Inc → WWC #2521**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Saiz Sand & Gravel → WWC #2521; 1950-01-01 to 1989-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Louis  Saiz → WWC #2521; 1950-01-01 to 1989-01-24; source msha-controller-operator-history
- **controller_controls_operator:** Louis  Saiz → Saiz Sand & Gravel; 1950-01-01 to 1989-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Aubrey → WWC #2521; 1986-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blaze Construction Inc → WWC #2521; 1989-01-25 to 1997-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Aubrey → Blaze Construction Inc; 1989-01-25 to 1997-03-31; source msha-controller-operator-history
- **operator_operates_mine:** W W C Inc → WWC #2521; 1997-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Wood → WWC #2521; 1997-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Wood → W W C Inc; 1997-04-01 to current/open; source msha-controller-operator-history