# Relationship history for MSHA mine 4103661

Current hierarchy: **Wallace Steve → Wallace Materials → Wallace Materials #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Wallace Steve → Wallace Materials #2; 1990-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wallace Materials → Wallace Materials #2; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wallace Steve → Wallace Materials; 1991-04-01 to current/open; source msha-controller-operator-history