# Relationship history for MSHA mine 1512184

Current hierarchy: **Brown J D & Robert V → North Central Stone Inc → North Central Stone Incorporated**

- 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:** Spencer County Stone Inc → North Central Stone Incorporated; 1979-12-01 to 1982-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Cox Claude Jr → North Central Stone Incorporated; 1979-12-01 to 1982-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Cox Claude Jr → Spencer County Stone Inc; 1979-12-01 to 1982-03-31; source msha-controller-operator-history
- **operator_operates_mine:** North Central Stone Inc → North Central Stone Incorporated; 1982-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brown J D & Robert V → North Central Stone Incorporated; 1982-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown J D & Robert V → North Central Stone Inc; 1982-04-01 to current/open; source msha-controller-operator-history