# Relationship history for MSHA mine 3606369

Current hierarchy: **Raymond  Martin → Raymar Mining Company → Kimmel Strip Mine No 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Zapata Corp → Kimmel Strip Mine No 1; 1974-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mears Coal Company → Kimmel Strip Mine No 1; 1977-03-01 to 1977-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Zapata Corp → Mears Coal Company; 1977-03-01 to 1977-06-08; source msha-controller-operator-history
- **operator_operates_mine:** Raymar Mining Company → Kimmel Strip Mine No 1; 1977-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Raymond  Martin et al → Kimmel Strip Mine No 1; 1977-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond  Martin et al → Raymar Mining Company; 1977-06-09 to current/open; source msha-controller-operator-history