Acoustics
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                            416020                                                              8 
                                                                                
                                                 Sensor holder for concave mirror Sensor holder for concave mirror  
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                            416021                                                              8 
                                                                                
                                                 Frame with holder Frame with holder  
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                            416030                                                              8 
                                                                                
                                                 Grating and slit for ultrasonics experiments Grating and slit for ultrasonics experiments  
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