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| Polytechnic University of Puerto Rico--Faculty--Research (7) |
| Polytechnic University of Puerto Rico--Undergraduates--Research (7) |
| Polytechnic University of Puerto Rico--Subject headings--Unassigned (5) |
| Antenna arrays (1) |
| Antennas (Electronics) (1) |
| Mass spectrometry (1) |
| Plasma probes (1) |
| Wireless communication system (1) |