# Relationship history for MSHA mine 3609369

Current hierarchy: **Chad E  Cross → Cross Excavating → Hemlock Hill Quarry**

- 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:** Jill D Cross → Hemlock Hill Quarry; 2004-01-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jill D. Cross → Hemlock Hill Quarry; 2005-09-28 to 2010-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Jill D Cross → Jill D. Cross; 2005-09-28 to 2010-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Cross Excavating → Hemlock Hill Quarry; 2010-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chad E  Cross → Hemlock Hill Quarry; 2010-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chad E  Cross → Cross Excavating; 2010-03-01 to current/open; source msha-controller-operator-history