# Relationship history for MSHA mine 0505144

Current hierarchy: **SSG Mining; Jeff  Carter → Salisbury Gladstone LLC → Gladstone Toll Mill**

- 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:** Salisbury Gladstone LLC → Gladstone Toll Mill; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** SSG Mining et al → Gladstone Toll Mill; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** SSG Mining et al → Salisbury Gladstone LLC; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Carter et al → Salisbury Gladstone LLC; 2022-01-01 to current/open; source msha-controller-operator-history