# Relationship history for MSHA mine 0200103

Current hierarchy: **USS Holdings Inc → US Silica Company → Cheto Mine**

- 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:** Engelhard Corp → Cheto Mine; 1950-01-01 to 2006-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Filtrol Corp → Cheto Mine; 1950-01-01 to 1981-03-31; source msha-controller-operator-history
- **controller_controls_mine:** U S Filter Corp → Cheto Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U S Filter Corp → Filtrol Corp; 1950-01-01 to 1981-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Filtrol Corp → Cheto Mine; 1981-04-01 to 1981-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → Cheto Mine; 1981-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Filtrol Corp; 1981-04-01 to 1981-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Filtrol Corp → Cheto Mine; 1981-12-15 to 1989-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Kaiser Aluminum & Chemical Corp → Cheto Mine; 1981-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kaiser Aluminum & Chemical Corp → Filtrol Corp; 1981-12-15 to 1989-06-28; source msha-controller-operator-history
- **operator_operates_mine:** BASF Catalysts LLC → Cheto Mine; 1989-06-29 to 2010-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Engelhard Corp → BASF Catalysts LLC; 1989-06-29 to 2006-07-31; source msha-controller-operator-history
- **controller_controls_mine:** USS Holdings Inc → Cheto Mine; 1996-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** BASF SE → Cheto Mine; 2006-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** BASF SE → BASF Catalysts LLC; 2006-08-01 to 2010-12-31; source msha-controller-operator-history
- **controller_controls_mine:** BASF SE → Cheto Mine; 2007-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** BASF Corporation → Cheto Mine; 2011-01-01 to 2018-05-13; source msha-controller-operator-history
- **controller_controls_operator:** BASF SE → BASF Corporation; 2011-01-01 to 2018-05-13; source msha-controller-operator-history
- **controller_controls_mine:** EP Management Corporation → Cheto Mine; 2017-07-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** EP Engineered Clays → Cheto Mine; 2018-05-14 to 2019-05-13; source msha-controller-operator-history
- **controller_controls_operator:** EP Management Corporation → EP Engineered Clays; 2018-05-14 to 2019-05-13; source msha-controller-operator-history
- **operator_operates_mine:** US Silica Company → Cheto Mine; 2019-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** USS Holdings Inc → US Silica Company; 2019-05-14 to current/open; source msha-controller-operator-history