# Relationship history for MSHA mine 2002891

Current hierarchy: **Johnny  Farmer → Farmer Sand & Gravel Inc → Pioneer #1**

- 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:** Johnny  Farmer  et al → Pioneer #1; 1992-08-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Farmer Sand & Gravel Inc → Pioneer #1; 1992-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnny  Farmer  et al → Farmer Sand & Gravel Inc; 1992-10-01 to current/open; source msha-controller-operator-history