# Relationship history for MSHA mine 3606437

Current hierarchy: **Martin Sherwood C Iii → Koala Energy Inc → Friendship Hill Farm**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Koala Energy Inc → Friendship Hill Farm; 1977-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Sherwood C Iii → Friendship Hill Farm; 1977-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Sherwood C Iii → Koala Energy Inc; 1977-05-01 to current/open; source msha-controller-operator-history