# Relationship history for MSHA mine 3609814

Current hierarchy: **Raymond J  Mast → R M Portables → R M Portable #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:** Enos E  Yoder et al → R M Portable #1; 2005-07-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R & E Quarry → R M Portable #1; 2009-11-24 to 2010-09-07; source msha-controller-operator-history
- **controller_controls_operator:** Enos E  Yoder et al → R & E Quarry; 2009-11-24 to 2010-09-07; source msha-controller-operator-history
- **controller_controls_operator:** Raymond  Mast et al → R & E Quarry; 2009-11-24 to 2010-09-07; source msha-controller-operator-history
- **operator_operates_mine:** R M Portables → R M Portable #1; 2010-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Raymond J  Mast → R M Portable #1; 2010-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond J  Mast → R M Portables; 2010-09-08 to current/open; source msha-controller-operator-history