# Relationship history for MSHA mine 2901475

Current hierarchy: **Vulcan Materials Company → CalMat Co → PLACITAS**

- 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:** Aldo M P  Vaio → PLACITAS; 1950-01-01 to 1987-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Springer Building Materials Corp → PLACITAS; 1986-06-01 to 1987-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Aldo M P  Vaio → Springer Building Materials Corp; 1986-06-01 to 1987-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Springer Building Materials Corp → PLACITAS; 1987-04-01 to 1988-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Co Inc & Redland Plc → PLACITAS; 1987-04-01 to 1988-06-13; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Co Inc & Redland Plc → Springer Building Materials Corp; 1987-04-01 to 1988-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Western Mobile New Mexico Inc → PLACITAS; 1988-06-14 to 1998-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Redland Plc → PLACITAS; 1988-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Redland Plc → Western Mobile New Mexico Inc; 1988-06-14 to 1998-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → PLACITAS; 1998-02-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western Mobile New Mexico Inc → PLACITAS; 1998-06-20 to 2001-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Western Mobile New Mexico Inc; 1998-06-20 to 2001-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → PLACITAS; 1999-01-06 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Southwest → PLACITAS; 2002-01-01 to 2014-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → PLACITAS; 2002-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Southwest; 2002-01-01 to 2014-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → PLACITAS; 2007-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** CalMat Co → PLACITAS; 2014-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → CalMat Co; 2014-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → CalMat Co; 2014-08-29 to 2007-11-15; source msha-controller-operator-history