# Relationship history for MSHA mine 3500507

Current hierarchy: **Jerome J  Collman → R. D. MAC, Inc. → R. D. MAC, 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:** R. D. MAC, Inc. → R. D. MAC, Inc.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerome J  Collman → R. D. MAC, Inc.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerome J  Collman → R. D. MAC, Inc.; 1950-01-01 to current/open; source msha-controller-operator-history