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I'd like to determine what non-technical factors would have in those years, influenced the choice of undertaking a large professional / corporate / government archival recording project on tape, wire or acetate disk. I'm focusing on cost, but am not forgetting required shelf space and permanence. (footage approximate because I'm not sure how they then packaged them) 3M products: 111 2400' hubs 111 4800' reels 112 2400' hubs 112 4800' reels 111 1200' on plastic reels 100 1200 on plastic reels 101 1200 on plastic reels Brush "ribbon": 1200' (first version circa '46 / '47---presumably the reels were as on my BK 401: brown painted steel--- apparently an 8mm film reel) as above for but for '48 -'49 (I'm assuming that there were packaging and price adjustments) Disk cutting: some examples of prices of professional disk cutting services (and blanks) would be helpful. Specifically, the cost of one half hour @ 33.33 rpm on one side each of two 16" or 17" aluminum base acetate coated disks. Tape Machines: other than the BK 401, what tape recorders running @ 7.5 ips (meaningfully smaller & less costly than the Ampex 200A) were available (shipping to dealers) in '48 - '49? What were their prices? Wire: costs for the various spool type, sizes & duration for 'standard' (i.e. Webcor), Armour (i.e. used on G.E. Model 50) & others I'd greatly appreciate any of you sharing whatever information to which you might have access. I'll be pleased to eventually post all of the data in aggregate form. Thanks, Art (Shiffy) Shifrin