# Relationship history for MSHA mine 3401671

Current hierarchy: **Roca Radiadores S A → International American Ceramics → MINE #1 TULSA**

- 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

- **operator_operates_mine:** Laufen International Ceramic Tile → MINE #1 TULSA; 1989-03-01 to 2000-09-07; source msha-controller-operator-history
- **controller_controls_mine:** Laufen Ceramics Inc → MINE #1 TULSA; 1989-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Laufen Ceramics Inc → Laufen International Ceramic Tile; 1989-03-01 to 2000-09-07; source msha-controller-operator-history
- **controller_controls_mine:** Roca Radiadores S A → MINE #1 TULSA; 1999-08-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** International American Ceramics → MINE #1 TULSA; 2000-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roca Radiadores S A → International American Ceramics; 2000-09-08 to current/open; source msha-controller-operator-history