# Relationship history for MSHA mine 1508710

Current hierarchy: **Skaggs Jim & Bobby Houchins → Jim-Bob Mining Company Inc → Rockport 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:** Skaggs Jim & Bobby Houchins → Rockport Mine; 1975-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jim-Bob Mining Company Inc → Rockport Mine; 1975-07-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Skaggs Jim & Bobby Houchins → Jim-Bob Mining Company Inc; 1975-07-18 to current/open; source msha-controller-operator-history