# Relationship history for MSHA mine 1700400

Current hierarchy: **William S  Williams → W S Williams Construction Company Inc → Williams Pit And Plant No 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

- **operator_operates_mine:** W S Williams Construction Company Inc → Williams Pit And Plant No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William S  Williams → Williams Pit And Plant No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William S  Williams → W S Williams Construction Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history