# Relationship history for MSHA mine 1100213

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → Kaskaskia Mine**

- 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:** Martin Marietta Materials Inc → Kaskaskia Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stotz Quarry Inc → Kaskaskia Mine; 1950-01-01 to 1985-03-19; source msha-controller-operator-history
- **controller_controls_mine:** Jo Ann  Stoltz Wild → Kaskaskia Mine; 1950-01-01 to 1985-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Jo Ann  Stoltz Wild → Stotz Quarry Inc; 1950-01-01 to 1985-03-19; source msha-controller-operator-history
- **operator_operates_mine:** Kaskaskia Stone Company → Kaskaskia Mine; 1985-03-20 to 1997-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Hurst  et al → Kaskaskia Mine; 1985-03-20 to 1997-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Hurst  et al → Kaskaskia Stone Company; 1985-03-20 to 1997-02-25; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → Kaskaskia Mine; 1997-02-26 to 2005-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1997-02-26 to 2005-05-18; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Kaskaskia Mine; 2005-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2005-05-19 to current/open; source msha-controller-operator-history