# Relationship history for MSHA mine 1901084

Current hierarchy: **Jon  Ridder → Ridder Farm Inc → RIDDER FARM 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Ridder Farm Inc → RIDDER FARM INC.; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jon  Ridder → RIDDER FARM INC.; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jon  Ridder → Ridder Farm Inc; 2000-04-01 to current/open; source msha-controller-operator-history