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| Model "MRa" / "MRb" | Model "M3a" | Model "MRc" | Model "MRcp" |
| Patent US 10,604,950 B2 | Patent US 7,296,948 B2 | Patent US 10,604,950 B2 | Patent US 10,604,950 B2 |
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| MRa $278.21 / MRb $187.22 | $359.21 | $167.29 | $69.23 |