# Relationship history for MSHA mine 0405468

Current hierarchy: **Saltchuck Resources Inc → Foss Maritime Company → DS-10**

- 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:** Marine Aggregate Services → DS-10; 2000-12-01 to 2002-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → DS-10; 2000-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Marine Aggregate Services; 2000-12-01 to 2002-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Foss Maritime Company → DS-10; 2002-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Saltchuck Resources Inc → DS-10; 2002-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Saltchuck Resources Inc → Foss Maritime Company; 2002-04-01 to current/open; source msha-controller-operator-history