# Relationship history for MSHA mine 2103184

Current hierarchy: **Dwayne  Bents; Susanne  Murphy → Murphy-Bents Joint Venture → Portable Plant**

- 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:** Murphy-Bents Joint Venture → Portable Plant; 1998-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dwayne  Bents → Portable Plant; 1998-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dwayne  Bents → Murphy-Bents Joint Venture; 1998-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Susanne  Murphy → Murphy-Bents Joint Venture; 1998-10-01 to current/open; source msha-controller-operator-history