Hi,
Found a reference code 'cob' for:
Netzschkauer Maschinenfabrik, Stark u. Soehne, Netzschkau, Saxony
The company still exists and is now called
"NEMA AirFin GmbH".
An interesting bit in their company history reveals that in 1934 they sold heating and ventilation systems to some arms manufacturors. Not unlikely that they tried to get a contract for producing magazine tubes.
quote:
1934
Auftr�¤ge zum Bau von Heizungs- und L�¼ftungsanlagen f�¼r R�¼stungsbetriebe
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