[ CENTRAL VACUUM CLEANING SYSTEMS FOR COMMERCIAL USE-NAMELY, CENTRAL POWER UNITS, CONDUITS, OUTLETS, SWITCHES, AND CLEANING ATTACHMENTS ]

BOOKS FOR USE IN EDUCATIONAL GROUP DISCUSSIONS, REPRINTS OF BOOKS, PRINTED GUIDES FOR READERS' AIDS, AND MANUALS FOR DISCUSSION LEADERS

HAIR SHAMPOO

REPAIR OF MUSICAL INSTRUMENTS

APHY AND MEDICAL TOMOGRAPHY, THEIR COMPONENTS AND ASSOCIATED ELEMENTS; SCANNERS, COLLIMATORS, ANALYZERS, VISUALIZERS AND RADIATION TOMOMETERS