
(a) Holmans Siphon slide for the microscope
(a) Holmans Siphon slide for the microscope, (b) Holmans Life slide for the microscope, ( c) Holmans current slide for the microscope
(a) Holmans Siphon slide for the microscope, (b) Holmans Life slide for the microscope, ( c) Holmans current slide for the microscope