Can You Help Identify Any Of These ?

Absolutely any info would be much apreciated, as I know very little about them. If you can help, then please Email me. Thanks.

507. This mystery key has a most unique design! There is just one central pillar (instead of the regular two outer pillars) with a gap adjuster mechanism, and the main arm is literally designed around the pillar. The metal work is coated in matt black crackle finish paint that gives a nice matt "dried mud" effect, the base is ebonite. The large knob and skirt (suspiciously Marconi like) also appear to be ebonite. The spring tensioner is right at the back of the key.
The ebonite base measures 4 & 3/8" by 2 & 7/8" ( 110mm by 73mm), the knob and skirt are 1 & 3/8" and 1 & 3/4" Dia. (35mm and 45mm) so not a small key this.
Who made it ? Why the amazing design?

Mystery Key 138.
  • A large and sleek professional design but with no identification marks that I can see. The base measures roughly 6&3/4" by 3&1/8" by 3/4" thick (170mm by 83mm by 20mm) and the weight is just over 3lbs. ( 1.506 Kg).
    There is a hole on the right side that doesn't seem to have a purpose, underneath can be seen two threaded holes perhaps for bolting the key to a base. Also - note the two sockets for the wiring, I have not seen that type on a morse key b4.

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    100..... An early British morse code bug key originally purchased from Webb's Radio, Soho, London in 1939. Believed only 10 made and this one has the serial number 004 stamped on the end of the wooden base. The base measures 6" by just under 3" (150mm by 72mm). Is it the elusive "ADGIL BUG" ? (See MM77 page 36).

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    019...... This mystery key is American. Similar in design to the Bowman / Boston key and mounted on a base of American Oak. Circa 1870'ish. Stamped under the arm is "FAIRBANKS PATENT" It was featured in Morsum Magnificat MM62 February 1999 page 32. ANY Info Please ?

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    "BK"