# Relationship history for MSHA mine 4605419

Current hierarchy: **Ball Fred → J R Mining Company → Mine #1**

- 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:** Dever Dharl → Mine #1; 1976-04-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dever & Dever Excavating Inc → Mine #1; 1977-01-01 to 1978-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Dever Dharl → Dever & Dever Excavating Inc; 1977-01-01 to 1978-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Wendy Coal Company Inc → Mine #1; 1978-12-01 to 1979-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Loos Robert C → Mine #1; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Loos Robert C → Wendy Coal Company Inc; 1978-12-01 to 1979-03-25; source msha-controller-operator-history
- **operator_operates_mine:** J R Mining Company → Mine #1; 1979-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ball Fred → Mine #1; 1979-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ball Fred → J R Mining Company; 1979-03-26 to current/open; source msha-controller-operator-history