# Relationship history for MSHA mine 3400616

Current hierarchy: **Larry H  Lemon → Oklahoma Construction Materials LLC → Oklahoma Construction Materials**

- 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:** Martin Marietta Materials Inc → Oklahoma Construction Materials; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Norman Asphalt Company → Oklahoma Construction Materials; 1950-01-01 to 2001-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Gary  Lohne → Oklahoma Construction Materials; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Lohne → Norman Asphalt Company; 1950-01-01 to 2001-05-30; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → Oklahoma Construction Materials; 2001-05-31 to 2004-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 2001-05-31 to 2004-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Oklahoma Construction Materials LLC → Oklahoma Construction Materials; 2004-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Larry H  Lemon  et al → Oklahoma Construction Materials; 2004-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry H  Lemon  et al → Oklahoma Construction Materials LLC; 2004-04-01 to current/open; source msha-controller-operator-history