# Relationship history for MSHA mine 1100216

Current hierarchy: **Heidelberg Materials AG → Material Service Corp → Tri County Quarry**

- 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:** General Dynamics Corp → Tri County Quarry; 1950-01-01 to 2006-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Tri-County Stone Company → Tri County Quarry; 1950-01-01 to 1983-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Bremer J C → Tri County Quarry; 1950-01-01 to 1983-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Bremer J C → Tri-County Stone Company; 1950-01-01 to 1983-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Material Service Corp → Tri County Quarry; 1983-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** General Dynamics Corp → Material Service Corp; 1983-06-29 to 2006-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Tri County Quarry; 2006-06-16 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Material Service Corp; 2006-06-16 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Tri County Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Material Service Corp; 2007-08-23 to current/open; source msha-controller-operator-history