# Relationship history for MSHA mine 3901504

Current hierarchy: **Marilyn J  Montgomery → Benchmark Enterprises LLC → Virginia**

- 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:** Benchmark Enterprises → Virginia; 2005-04-28 to 2015-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Richard Scott  Cullum → Virginia; 2005-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard Scott  Cullum → Benchmark Enterprises; 2005-04-28 to 2015-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Benchmark Enterprises LLC → Virginia; 2015-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marilyn J  Montgomery → Virginia; 2015-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marilyn J  Montgomery → Benchmark Enterprises LLC; 2015-03-01 to current/open; source msha-controller-operator-history