# Relationship history for MSHA mine 2002810

Current hierarchy: **Johnny  Farmer → Farmer Sand & Gravel Inc → FARMER SAND & GRAVEL, 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Rock Crete Sand & Gravel Inc → FARMER SAND & GRAVEL, INC.; 1988-08-01 to 1992-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Marcello  Scapitticci et al → FARMER SAND & GRAVEL, INC.; 1988-08-01 to 1992-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Marcello  Scapitticci et al → Rock Crete Sand & Gravel Inc; 1988-08-01 to 1992-08-19; source msha-controller-operator-history
- **operator_operates_mine:** Farmer Sand & Gravel Inc → FARMER SAND & GRAVEL, INC.; 1992-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnny  Farmer  et al → FARMER SAND & GRAVEL, INC.; 1992-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnny  Farmer  et al → Farmer Sand & Gravel Inc; 1992-08-20 to current/open; source msha-controller-operator-history