# Relationship history for MSHA mine 3607717

Current hierarchy: **Lamolinara Nat A → Diversified Energy Recoveries → Standard Pile**

- 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:** Solstat Coal Company → Standard Pile; 1985-10-01 to 1988-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Crack Frederick G → Standard Pile; 1985-10-01 to 1988-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Crack Frederick G → Solstat Coal Company; 1985-10-01 to 1988-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Solstat Coal Company → Standard Pile; 1988-06-01 to 1995-04-16; source msha-controller-operator-history
- **controller_controls_mine:** Geevor Inc → Standard Pile; 1988-06-01 to 1995-04-16; source msha-controller-operator-history
- **controller_controls_operator:** Geevor Inc → Solstat Coal Company; 1988-06-01 to 1995-04-16; source msha-controller-operator-history
- **operator_operates_mine:** Diversified Energy Recoveries → Standard Pile; 1995-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lamolinara Nat A → Standard Pile; 1995-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lamolinara Nat A → Diversified Energy Recoveries; 1995-04-17 to current/open; source msha-controller-operator-history