# Relationship history for MSHA mine 3304040

Current hierarchy: **John E  Ling → L & M Mineral Co. → L & M Coal Operation - Tusc. County**

- 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 & M Mineral Company → L & M Coal Operation - Tusc. County; 1985-12-01 to 2003-09-26; source msha-controller-operator-history
- **controller_controls_mine:** Holmes Limestone → L & M Coal Operation - Tusc. County; 1985-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holmes Limestone → L & M Mineral Company; 1985-12-01 to 2003-09-26; source msha-controller-operator-history
- **controller_controls_mine:** John E  Ling → L & M Coal Operation - Tusc. County; 2003-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L & M Mineral Co. → L & M Coal Operation - Tusc. County; 2003-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John E  Ling → L & M Mineral Co.; 2003-09-27 to current/open; source msha-controller-operator-history