# Relationship history for MSHA mine 3606858

Current hierarchy: **Johns Roy F-Earle W Kazis → Xecol Corp → Mine No 4**

- 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:** Johns Roy F-Earle W Kazis Et Al → Mine No 4; 1977-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Xecol Corp → Mine No 4; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johns Roy F-Earle W Kazis Et Al → Xecol Corp; 1979-07-01 to current/open; source msha-controller-operator-history