# Relationship history for MSHA mine 1201932

Current hierarchy: **Covia Holdings LLC → Covia Clay LLC → Huntingburg Mill**

- 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:** S C R-Sibelco Nv et al → Huntingburg Mill; 1950-01-01 to 2020-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Yellow Banks Clay Products Inc → Huntingburg Mill; 1984-03-01 to 1990-08-20; source msha-controller-operator-history
- **controller_controls_mine:** Leon J  Olinger → Huntingburg Mill; 1984-03-01 to 1990-08-20; source msha-controller-operator-history
- **controller_controls_operator:** Leon J  Olinger → Yellow Banks Clay Products Inc; 1984-03-01 to 1990-08-20; source msha-controller-operator-history
- **controller_controls_mine:** Watts Blake Bearne & Company Plc → Huntingburg Mill; 1989-04-01 to 1999-09-30; source msha-controller-operator-history
- **operator_operates_mine:** United Clays Inc → Huntingburg Mill; 1990-08-21 to 1999-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Watts Blake Bearne & Company Plc → United Clays Inc; 1990-08-21 to 1999-09-30; source msha-controller-operator-history
- **operator_operates_mine:** COVIA HOLDINGS CORPORATION → Huntingburg Mill; 1999-10-01 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_operator:** S C R-Sibelco Nv et al → COVIA HOLDINGS CORPORATION; 1999-10-01 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Covia Holdings LLC → Huntingburg Mill; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Covia Holdings LLC → COVIA HOLDINGS CORPORATION; 2021-01-01 to 2020-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Covia Clay LLC → Huntingburg Mill; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Covia Holdings LLC → Covia Clay LLC; 2021-01-01 to current/open; source msha-controller-operator-history