Water level indicators
Water level indicators, remote reading James Gordon "IGFMA" patent no. 605796 by Th. and J. Daniels. 2 of. Serial nos. G3567A and G3568A
Water level indicators, remote reading James Gordon "IGFMA" patent no. 605796 by Th. and J. Daniels. 2 of. Serial nos. G3567A and G3568A