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REELS AND CANISTERS FOR MAGNETIC TAPE AND FOR X-RAY AND CINEMATOGRAPHIC FILM; CIRCUMFERENTIAL SEALS FOR SUCH REELS AND CANISTERS WHICH SURROUND THE CIRCUMFERENCES OF SUCH REELS AND CANISTERS AND PROTECT THE TAPE OR FILM ON THE REEL OR IN THE CANISTER AND WHICH MAY BE REMOVED FOR ACCESS TO THE TAPE OR FILM; HANGERS FOR SUCH REELS, CANISTERS AND SEALS WHICH ARE USED TO SUSPEND SUCH REELS AND CANISTERS FROM SUSPENSION TYPE FILING EQUIPMENT