# Relationship history for MSHA mine 1300262

Current hierarchy: **Richard R  Davidson → Consumer Limestone Products Company → Malvern**

- 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:** Kaser Corp → Malvern; 1950-01-01 to 1983-05-29; source msha-controller-operator-history
- **controller_controls_mine:** Kaser Corporation et al → Malvern; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kaser Corporation et al → Kaser Corp; 1950-01-01 to 1983-05-29; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc et al → Kaser Corp; 1950-01-01 to 1983-05-29; source msha-controller-operator-history
- **operator_operates_mine:** Consumer Limestone Products Company → Malvern; 1983-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard R  Davidson  et al → Malvern; 1983-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard R  Davidson  et al → Consumer Limestone Products Company; 1983-05-30 to current/open; source msha-controller-operator-history