# Relationship history for MSHA mine 4101343

Current hierarchy: **Ingram Readymix → INGRAM READYMIX NO. 87, L.L.C. → Del Rio Pit & Plant #87**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Capitol Aggregates Ltd → Del Rio Pit & Plant #87; 1950-01-01 to 2008-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Zachry Corporation → Del Rio Pit & Plant #87; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zachry Corporation → Capitol Aggregates Ltd; 1950-01-01 to 2008-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Bruce  Ingram et al → Del Rio Pit & Plant #87; 1994-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ingram Readymix Inc → Del Rio Pit & Plant #87; 2008-06-12 to 2011-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Bruce  Ingram et al → Ingram Readymix Inc; 2008-06-12 to 2011-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Ingram Readymix No. 87, L. L. C. → Del Rio Pit & Plant #87; 2011-01-02 to 2013-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Bruce  Ingram et al → Del Rio Pit & Plant #87; 2011-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruce  Ingram et al → Ingram Readymix No. 87, L. L. C.; 2011-01-02 to 2013-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Ingram Readymix Inc. → Del Rio Pit & Plant #87; 2013-04-23 to 2025-12-14; source msha-controller-operator-history
- **controller_controls_operator:** Bruce  Ingram et al → Ingram Readymix Inc.; 2013-04-23 to 2025-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Ingram Readymix → Del Rio Pit & Plant #87; 2025-02-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** INGRAM READYMIX NO. 87, L.L.C. → Del Rio Pit & Plant #87; 2025-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ingram Readymix → INGRAM READYMIX NO. 87, L.L.C.; 2025-12-15 to current/open; source msha-controller-operator-history