![Hi all! This is my mk4 gsr, mace in 1939, along with the filter dated 1938. I've written the history of the mask down in the comments : r/gasmasks Hi all! This is my mk4 gsr, mace in 1939, along with the filter dated 1938. I've written the history of the mask down in the comments : r/gasmasks](https://preview.redd.it/hi-all-this-is-my-mk4-gsr-mace-in-1939-along-with-the-v0-06pp1snovwe91.jpg?width=640&crop=smart&auto=webp&s=00aa37286f3187ab9a3fbb9d2bb5796ce0f8d3f0)
Hi all! This is my mk4 gsr, mace in 1939, along with the filter dated 1938. I've written the history of the mask down in the comments : r/gasmasks
![Examples of double-sided frequency filters for the GSR channels 183.31... | Download Scientific Diagram Examples of double-sided frequency filters for the GSR channels 183.31... | Download Scientific Diagram](https://www.researchgate.net/publication/241642386/figure/fig3/AS:298688304959489@1448224249127/Examples-of-double-sided-frequency-filters-for-the-GSR-channels-18331-7-and-18331.png)
Examples of double-sided frequency filters for the GSR channels 183.31... | Download Scientific Diagram
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Hf138 Motorcycle Oil Grid Filter For Suzuki Gsr600 Gsr-600 Gsr 600 K6 K7 K8 K9 L0 B Yoshimura 2006-2010 Moto Cleaner Filters - Oil Filters - AliExpress
![Examples of double-sided frequency filters for the GSR channels 183.31... | Download Scientific Diagram Examples of double-sided frequency filters for the GSR channels 183.31... | Download Scientific Diagram](https://www.researchgate.net/profile/D-Cimini/publication/241642386/figure/fig3/AS:298688304959489@1448224249127/Examples-of-double-sided-frequency-filters-for-the-GSR-channels-18331-7-and-18331_Q640.jpg)
Examples of double-sided frequency filters for the GSR channels 183.31... | Download Scientific Diagram
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