# Relationship history for MSHA mine 0103042

Current hierarchy: **Harry E  Lambert → Sand & Gravel Materials Llc → PIT #2**

- 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:** C R  Campbell Sr et al → PIT #2; 1990-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** South Alabama Materials Inc → PIT #2; 1994-11-01 to 1999-05-31; source msha-controller-operator-history
- **controller_controls_operator:** C R  Campbell Sr et al → South Alabama Materials Inc; 1994-11-01 to 1999-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Sand & Gravel Materials Llc → PIT #2; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harry E  Lambert → PIT #2; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harry E  Lambert → Sand & Gravel Materials Llc; 1999-06-01 to current/open; source msha-controller-operator-history