# Relationship history for MSHA mine 4102617

Current hierarchy: **US Concrete → Ingram Concrete LLC → ROBERT LEE PIT**

- 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:** Sanco Materials Company → ROBERT LEE PIT; 1950-01-01 to 2001-03-31; source msha-controller-operator-history
- **controller_controls_mine:** J B  Fraley → ROBERT LEE PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J B  Fraley → Sanco Materials Company; 1950-01-01 to 2001-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Atlas Concrete Inc → ROBERT LEE PIT; 1988-05-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sanco Materials Company → ROBERT LEE PIT; 2001-04-01 to 2006-07-04; source msha-controller-operator-history
- **controller_controls_mine:** Jerry  Roberts → ROBERT LEE PIT; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Roberts → Sanco Materials Company; 2001-04-01 to 2006-07-04; source msha-controller-operator-history
- **operator_operates_mine:** Ingram Enterprises L P → ROBERT LEE PIT; 2006-07-05 to 2008-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Atlas Concrete Inc → Ingram Enterprises L P; 2006-07-05 to 2008-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Ingram Concrete LLC → ROBERT LEE PIT; 2008-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** US Concrete → ROBERT LEE PIT; 2008-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** US Concrete → Ingram Concrete LLC; 2008-03-01 to current/open; source msha-controller-operator-history