# Relationship history for MSHA mine 3003718

Current hierarchy: **Kurt  Harvey → HARVEY MATERIALS CORPORATION → EXTEC S-5 SER# 12022**

- 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

- **controller_controls_mine:** Gary A  Harvey → EXTEC S-5 SER# 12022; 2006-02-17 to 2021-03-16; source msha-controller-operator-history
- **operator_operates_mine:** Harvey Materials Corporation → EXTEC S-5 SER# 12022; 2009-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary A  Harvey → Harvey Materials Corporation; 2009-10-06 to 2021-03-16; source msha-controller-operator-history
- **controller_controls_mine:** Kurt  Harvey → EXTEC S-5 SER# 12022; 2021-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kurt  Harvey → Harvey Materials Corporation; 2021-03-17 to current/open; source msha-controller-operator-history