# Relationship history for MSHA mine 4502611

Current hierarchy: **Gary  Merlino; Don  Merlino → Sumner Sand & Gravel, LLC → Sumner 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Keith  Benson  et al → Sumner Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** City Transfer Inc → Sumner Mine; 1979-01-01 to 1979-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Benson  et al → City Transfer Inc; 1979-01-01 to 1979-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Ronald G  Benson  et al → City Transfer Inc; 1979-01-01 to 1979-07-15; source msha-controller-operator-history
- **operator_operates_mine:** M & M Crushing Company Inc → Sumner Mine; 1979-07-16 to 1979-10-20; source msha-controller-operator-history
- **controller_controls_mine:** Mosby Wayne → Sumner Mine; 1979-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mosby Wayne → M & M Crushing Company Inc; 1979-07-16 to 1979-10-20; source msha-controller-operator-history
- **operator_operates_mine:** City Transfer Inc → Sumner Mine; 1979-10-21 to 2014-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Ronald G  Benson  et al → City Transfer Inc; 1979-10-21 to 2014-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Benson  et al → City Transfer Inc; 1979-10-21 to 2014-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Sumner Sand & Gravel, LLC → Sumner Mine; 2014-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Don  Merlino et al → Sumner Mine; 2014-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don  Merlino et al → Sumner Sand & Gravel, LLC; 2014-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Merlino et al → Sumner Sand & Gravel, LLC; 2014-04-01 to current/open; source msha-controller-operator-history