# Relationship history for MSHA mine 2800521

Current hierarchy: **Hinchman Ronald J → Herbert J Hinchman & Son Inc → Herbert J Hinchman And Son 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Herbert J Hinchman & Son Inc → Herbert J Hinchman And Son Incorporated; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hinchman Ronald J → Herbert J Hinchman And Son Incorporated; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hinchman Ronald J → Herbert J Hinchman & Son Inc; 1950-01-01 to current/open; source msha-controller-operator-history