# Relationship history for MSHA mine 1510142

Current hierarchy: **Wright Gene → Floyd Eastern Coal Company Inc → No 2 Mine**

- 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:** Price Coal Company → No 2 Mine; 1976-12-01 to 1977-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Price Vince → No 2 Mine; 1976-12-01 to 1977-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Price Vince → Price Coal Company; 1976-12-01 to 1977-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Wright Gene → No 2 Mine; 1976-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Floyd Eastern Coal Company Inc → No 2 Mine; 1977-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wright Gene → Floyd Eastern Coal Company Inc; 1977-03-01 to current/open; source msha-controller-operator-history