# Relationship history for MSHA mine 4700869

Current hierarchy: **Adam B  Kelley; Regina  Pontow → Kelley Sand & Gravel, Inc. → Kelley Wash Plant**

- 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:** Kelley Sand & Gravel → Kelley Wash Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Elwyn  Kelley → Kelley Wash Plant; 1950-01-01 to 2019-05-21; source msha-controller-operator-history
- **controller_controls_operator:** Elwyn  Kelley → Kelley Sand & Gravel; 1950-01-01 to 2019-05-21; source msha-controller-operator-history
- **controller_controls_mine:** Nolan  Kelley → Kelley Wash Plant; 2019-05-22 to 2019-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Nolan  Kelley → Kelley Sand & Gravel; 2019-05-22 to 2019-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Adam B  Kelley et al → Kelley Wash Plant; 2020-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adam B  Kelley et al → Kelley Sand & Gravel; 2020-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Regina  Pontow et al → Kelley Sand & Gravel; 2020-01-01 to current/open; source msha-controller-operator-history