# Relationship history for MSHA mine 0403623

Current hierarchy: **Eddie  Antonini → Twin Mountain Rock Venture → Twin Mountain Rock Venture**

- 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:** Peter Kiewit Sons' Inc → Twin Mountain Rock; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Twin Mountain Rock Company → Twin Mountain Rock; 1979-12-01 to 1994-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Peter Kiewit Sons' Inc → Twin Mountain Rock Company; 1979-12-01 to 1994-07-25; source msha-controller-operator-history
- **operator_operates_mine:** Twin Mountain Rock Venture → Twin Mountain Rock; 1994-07-26 to 2002-09-25; source msha-controller-operator-history
- **controller_controls_mine:** Angelus Block Co  et al → Twin Mountain Rock; 1994-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Angelus Block Co  et al → Twin Mountain Rock Venture; 1994-07-26 to 2002-09-25; source msha-controller-operator-history
- **controller_controls_operator:** Kiewit Peter Sons' Inc  et al → Twin Mountain Rock Venture; 1994-07-26 to 2002-09-25; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Twin Mountain Rock; 2001-07-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rinker Materials Western Inc → Twin Mountain Rock; 2002-09-26 to 2008-10-28; source msha-controller-operator-history
- **controller_controls_mine:** CSR Ltd → Twin Mountain Rock; 2002-09-26 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_operator:** CSR Ltd → Rinker Materials Western Inc; 2002-09-26 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Rinker Group Ltd → Twin Mountain Rock; 2003-04-01 to 2007-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Rinker Group Ltd → Rinker Materials Western Inc; 2003-04-01 to 2007-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Twin Mountain Rock; 2007-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Rinker Materials Western Inc; 2007-07-10 to 2008-10-28; source msha-controller-operator-history
- **operator_operates_mine:** Cemex Construction Materials LP → Twin Mountain Rock; 2008-10-29 to 2015-05-28; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Cemex Construction Materials LP; 2008-10-29 to 2015-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Twin Mountain Rock Venture → Twin Mountain Rock; 2015-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eddie  Antonini → Twin Mountain Rock; 2015-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eddie  Antonini → Twin Mountain Rock Venture; 2015-05-29 to current/open; source msha-controller-operator-history