# Relationship history for MSHA mine 3606321

Current hierarchy: **Adams John V → A & M Commodities Inc → Mar & Co**

- 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:** Vza Corp → Mar & Co; 1977-01-01 to 1981-04-15; source msha-controller-operator-history
- **controller_controls_mine:** Vizza Joseph → Mar & Co; 1977-01-01 to 1981-04-15; source msha-controller-operator-history
- **controller_controls_operator:** Vizza Joseph → Vza Corp; 1977-01-01 to 1981-04-15; source msha-controller-operator-history
- **operator_operates_mine:** A & M Commodities Inc → Mar & Co; 1981-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adams John V → Mar & Co; 1981-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adams John V → A & M Commodities Inc; 1981-04-16 to current/open; source msha-controller-operator-history