# Relationship history for MSHA mine 3608873

Current hierarchy: **Chad E  Cross → Cross Excavating → Extec Mega Bite Crusher**

- 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:** Clifford  Cross Jr → Extec Mega Bite Crusher; 1987-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Clifford Cross Jr → Extec Mega Bite Crusher; 2000-08-01 to 2004-01-07; source msha-controller-operator-history
- **controller_controls_operator:** Clifford  Cross Jr → Clifford Cross Jr; 2000-08-01 to 2004-01-07; source msha-controller-operator-history
- **operator_operates_mine:** Jill D. Cross → Extec Mega Bite Crusher; 2004-01-08 to 2010-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Jill D Cross → Extec Mega Bite Crusher; 2004-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jill D Cross → Jill D. Cross; 2004-01-08 to 2010-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Cross Excavating → Extec Mega Bite Crusher; 2010-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chad E  Cross → Extec Mega Bite Crusher; 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