# Relationship history for MSHA mine 4702896

Current hierarchy: **Lafarge S A → Lafarge-Wisconsin Division → WATERFORD PIT (YARD 17)**

- 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:** Robert G  Tews et al → WATERFORD PIT (YARD 17); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tews Company → WATERFORD PIT (YARD 17); 1990-01-01 to 1998-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Robert G  Tews et al → Tews Company; 1990-01-01 to 1998-06-30; source msha-controller-operator-history
- **controller_controls_operator:** William L  Tews et al → Tews Company; 1990-01-01 to 1998-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge-Wisconsin Division → WATERFORD PIT (YARD 17); 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → WATERFORD PIT (YARD 17); 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge-Wisconsin Division; 1998-07-01 to current/open; source msha-controller-operator-history