# Relationship history for MSHA mine 4703588

Current hierarchy: **Randall A Johnson; Jill L Pesick → Johnson Sand & Gravel Inc → Portable No 8**

- 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:** Jeffrey G  Johnson et al → Portable No 8; 1950-01-01 to 2022-01-28; source msha-controller-operator-history
- **operator_operates_mine:** Johnson Sand & Gravel Inc → Portable No 8; 2010-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey G  Johnson et al → Johnson Sand & Gravel Inc; 2010-05-07 to 2022-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Randall A Johnson et al → Portable No 8; 2022-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randall A Johnson et al → Johnson Sand & Gravel Inc; 2022-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jill L Pesick et al → Johnson Sand & Gravel Inc; 2022-01-29 to current/open; source msha-controller-operator-history