# Relationship history for MSHA mine 4607747

Current hierarchy: **Carmen  D'Angelo → Coal Cave Inc → Sawpit 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:** Carmen  D'Angelo → Sawpit Mine; 1977-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Oak Mining Inc → Sawpit Mine; 1989-08-01 to 1992-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Whitt Christopher → Sawpit Mine; 1989-08-01 to 1992-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Whitt Christopher → Black Oak Mining Inc; 1989-08-01 to 1992-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Ka-Ron Enterprises Of Virginia Inc → Sawpit Mine; 1992-03-23 to 1992-12-28; source msha-controller-operator-history
- **controller_controls_mine:** Turner Fran E Et Al → Sawpit Mine; 1992-03-23 to 1992-12-28; source msha-controller-operator-history
- **controller_controls_operator:** Turner Fran E Et Al → Ka-Ron Enterprises Of Virginia Inc; 1992-03-23 to 1992-12-28; source msha-controller-operator-history
- **operator_operates_mine:** Coal Cave Inc → Sawpit Mine; 1992-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carmen  D'Angelo → Coal Cave Inc; 1992-12-29 to current/open; source msha-controller-operator-history