# Relationship history for MSHA mine 1102701

Current hierarchy: **Maryl  Betzwiser; Grant  Avery → Valley Run Stone Div/Avery Gravel Co Inc → Valley Run Stone Div/Avery Gravel Co Inc**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Grant  Avery et al → Valley Run Stone Div/Avery Gravel Co Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Valley Run Stone Div/Avery Gravel Co Inc → Valley Run Stone Div/Avery Gravel Co Inc; 1979-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grant  Avery et al → Valley Run Stone Div/Avery Gravel Co Inc; 1979-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maryl  Betzwiser et al → Valley Run Stone Div/Avery Gravel Co Inc; 1979-12-01 to current/open; source msha-controller-operator-history