# Relationship history for MSHA mine 3607270

Current hierarchy: **Robert  Spencer → L & J Energy Co., Inc. → Garmantown Mine**

- 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:** L & J Energy Company Inc → Garmantown Mine; 1982-02-01 to 1990-03-02; source msha-controller-operator-history
- **controller_controls_mine:** Louis  Monborne → Garmantown Mine; 1982-02-01 to 1990-03-02; source msha-controller-operator-history
- **controller_controls_operator:** Louis  Monborne → L & J Energy Company Inc; 1982-02-01 to 1990-03-02; source msha-controller-operator-history
- **operator_operates_mine:** L & J Energy Co., Inc. → Garmantown Mine; 1990-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Spencer → Garmantown Mine; 1990-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Spencer → L & J Energy Co., Inc.; 1990-03-03 to current/open; source msha-controller-operator-history