MJ Speis
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MJ Speis (born ?) was an aero inventor.
References
« Chronologie Aéronautique » pages of Aéro-Manuel
... 1873
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LTA (Dirigible, rigid, aluminium, having alleged effect on later Von Zeppelin activity; some French sources go as far as to allege that Zeppelin was not an inventor, per se, as much as he was a man of solid work ethic who applied the principles invented by Speis.)
