# Relationship history for MSHA mine 1302207

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Aggregates Of Iowa Inc → PLANT #839 PORTABLE SAND 2**

- 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

- **controller_controls_mine:** William H  Giese → PLANT #839 PORTABLE SAND 2; 1980-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Giese Construction Company Inc → PLANT #839 PORTABLE SAND 2; 1996-04-01 to 1997-04-30; source msha-controller-operator-history
- **controller_controls_operator:** William H  Giese → Giese Construction Company Inc; 1996-04-01 to 1997-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Nuckoll'S Aggregates Inc → PLANT #839 PORTABLE SAND 2; 1997-05-01 to 1997-05-16; source msha-controller-operator-history
- **controller_controls_mine:** Scott L Temple et al → PLANT #839 PORTABLE SAND 2; 1997-05-01 to 1997-05-16; source msha-controller-operator-history
- **controller_controls_operator:** Scott L Temple et al → Nuckoll'S Aggregates Inc; 1997-05-01 to 1997-05-16; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates Of Iowa Inc → PLANT #839 PORTABLE SAND 2; 1997-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → PLANT #839 PORTABLE SAND 2; 1997-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates Of Iowa Inc; 1997-05-17 to current/open; source msha-controller-operator-history