# Relationship history for MSHA mine 2100641

Current hierarchy: **GCC SAB de CV → Consolidated Ready Mix → Consolidated Ready Mix**

- 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

- **operator_operates_mine:** W J Stolpman → Consolidated Ready Mix; 1950-01-01 to 1981-06-30; source msha-controller-operator-history
- **controller_controls_mine:** W J  Stolpman → Consolidated Ready Mix; 1950-01-01 to 1984-07-19; source msha-controller-operator-history
- **controller_controls_operator:** W J  Stolpman → W J Stolpman; 1950-01-01 to 1981-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Stolpman Sand & Gravel → Consolidated Ready Mix; 1981-07-01 to 1983-10-10; source msha-controller-operator-history
- **controller_controls_mine:** James  Radermacher → Consolidated Ready Mix; 1981-07-01 to 1983-10-10; source msha-controller-operator-history
- **controller_controls_operator:** James  Radermacher → Stolpman Sand & Gravel; 1981-07-01 to 1983-10-10; source msha-controller-operator-history
- **operator_operates_mine:** Stolpman Sand & Gravel → Consolidated Ready Mix; 1983-10-11 to 2007-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Roy  Stolpman → Consolidated Ready Mix; 1983-10-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy  Stolpman → Stolpman Sand & Gravel; 1983-10-11 to 2007-04-11; source msha-controller-operator-history
- **controller_controls_mine:** GCC SAB de CV → Consolidated Ready Mix; 2006-01-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Consolidated Ready Mix → Consolidated Ready Mix; 2007-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** GCC SAB de CV → Consolidated Ready Mix; 2007-04-12 to current/open; source msha-controller-operator-history