# Relationship history for MSHA mine 0405505

Current hierarchy: **Jim  Elfring → KEC Engineering → River Road Sand Job**

- 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

- **operator_operates_mine:** KEC Engineering → River Road Sand Job; 2001-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jim  Elfring → River Road Sand Job; 2001-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jim  Elfring → KEC Engineering; 2001-11-06 to current/open; source msha-controller-operator-history