# Relationship history for MSHA mine 5100239

Current hierarchy: **Larry  Isemoto → Isemoto Contracting Company Ltd → Crusher B**

- 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:** Larry  Isemoto et al → Crusher B; 1991-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Isemoto Contracting Company Ltd → Crusher B; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Isemoto et al → Isemoto Contracting Company Ltd; 2001-05-01 to current/open; source msha-controller-operator-history