# Relationship history for MSHA mine 0503748

Current hierarchy: **Amrize Ltd → Amrize West Central Inc. → Amrize Table Mountain Quarry**

- 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:** Continental Materials Corp → Amrize Table Mountain Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Table Mountain Quarries Inc → Amrize Table Mountain Quarry; 1981-11-01 to 1999-02-24; source msha-controller-operator-history
- **controller_controls_mine:** Vern  Toews et al → Amrize Table Mountain Quarry; 1981-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vern  Toews et al → Table Mountain Quarries Inc; 1981-11-01 to 1999-02-24; source msha-controller-operator-history
- **controller_controls_mine:** Daniel E  Tezak → Amrize Table Mountain Quarry; 1993-04-17 to 2023-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Table Mountain Quarry; 1997-05-14 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Castle Concrete Company/Transit Mix Concrete → Amrize Table Mountain Quarry; 1999-02-25 to 2008-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Continental Materials Corp → Castle Concrete Company/Transit Mix Concrete; 1999-02-25 to 2008-03-30; source msha-controller-operator-history
- **operator_operates_mine:** Tezak Heavy Equipment → Amrize Table Mountain Quarry; 2008-03-31 to 2008-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Daniel E  Tezak → Tezak Heavy Equipment; 2008-03-31 to 2008-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Castle Concrete Company/Transit Mix Concrete → Amrize Table Mountain Quarry; 2008-04-01 to 2008-04-01; source msha-controller-operator-history
- **controller_controls_operator:** Continental Materials Corp → Castle Concrete Company/Transit Mix Concrete; 2008-04-01 to 2008-04-01; source msha-controller-operator-history
- **operator_operates_mine:** Tezak Heavy Equipment, LLC → Amrize Table Mountain Quarry; 2008-04-02 to 2023-08-08; source msha-controller-operator-history
- **controller_controls_operator:** Daniel E  Tezak → Tezak Heavy Equipment, LLC; 2008-04-02 to 2023-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Table Mountain Quarry; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Table Mountain Quarry; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Table Mountain Quarry; 2023-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Tezak Heavy Equipment; 2023-03-31 to 2008-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Tezak Heavy Equipment, LLC; 2023-03-31 to 2023-08-08; source msha-controller-operator-history
- **operator_operates_mine:** Amrize West Central Inc. → Amrize Table Mountain Quarry; 2023-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize West Central Inc.; 2023-08-09 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize West Central Inc.; 2023-08-09 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Amrize West Central Inc.; 2023-08-09 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Table Mountain Quarry; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize West Central Inc.; 2025-06-23 to current/open; source msha-controller-operator-history