# Relationship history for MSHA mine 3700187

Current hierarchy: **Raymond E  Johnson; Lynda N  Ibbotson → Damian Associates LLC → Simpson Pit**

- 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:** Damian Associates LLC → Simpson Pit; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lynda N  Ibbotson  et al → Simpson Pit; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lynda N  Ibbotson  et al → Damian Associates LLC; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond E  Johnson  et al → Damian Associates LLC; 1998-04-01 to current/open; source msha-controller-operator-history