# Relationship history for MSHA mine 3000880

Current hierarchy: **Power & Construction Group Inc → Valley Sand & Gravel Inc → Avon Site**

- 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:** Valley Sand & Gravel Corp → Avon Site; 1950-01-01 to 1983-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Robert L  Finewood → Avon Site; 1950-01-01 to 1983-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Finewood → Valley Sand & Gravel Corp; 1950-01-01 to 1983-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Valley Sand & Gravel Inc → Avon Site; 1983-07-12 to 2015-10-07; source msha-controller-operator-history
- **controller_controls_mine:** Richard A  Ash → Avon Site; 1983-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard A  Ash → Valley Sand & Gravel Inc; 1983-07-12 to 2015-10-07; source msha-controller-operator-history
- **controller_controls_mine:** Power & Construction Group Inc → Avon Site; 1994-06-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Valley Sand & Gravel Inc → Avon Site; 2015-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Power & Construction Group Inc → Valley Sand & Gravel Inc; 2015-10-08 to current/open; source msha-controller-operator-history