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                "title": "City of Westminster"
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            "value": "Concertina, MacCann duet system.Serial number 4020. Dodecagonal. Seventy three buttons: 33 on left-hand side; 39 on right-hand side; and one air button. Buttons are chrome domed. Round-end steel reeds. Eight-fold black leather bellows. Left-hand strap is original with Lachenal gilt, right-hand strap has been added later. Straps are fixed on wooden hand bars with nickel screws and bone clamps. Very ornate chromed nickel fretwork, inset to ends. Serial number 4020. Engraved on the scroll label: The Edeophone Duet, Lachenal & Co, London WC.",
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        },
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            "value": "Concertina, MacCann duet system. Dodecagonal. Seventy three buttons: 33 on left-hand side; 39 on right-hand side; and one air button. Buttons are chrome domed. Round-end steel reeds. Eight-fold black leather bellows. Left-hand strap is original with Lachenal gilt, right-hand strap has been added later. Straps are fixed on wooden hand bars with nickel screws and bone clamps. Very ornate chromed nickel fretwork, inset to ends. Serial number 4020. Engraved on the scroll label: The Edeophone Duet, Lachenal & Co, London WC."
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            "value": "Concertina, MacCann duet system. Dodecagonal. 73 buttons: 33 on left-hand side; 39 on right-hand side; and 1 air button. Buttons are chrome domed. Round-end steel reeds. Eight-fold black leather bellows. Left-hand strap is original with Lachenal gilt, right-hand strap has been added later. Straps are fixed on wooden hand bars with nickel screws and bone clamps. Very ornate chromed nickel fretwork, inset to ends. Serial number 4020. Engraved on the scroll label: The Edeophone Duet, Lachenal & Co, London WC."
        },
        {
            "historical": true,
            "type": "description",
            "value": "Concertina, MacCann  duet system. Dodecagonal. 73 buttons: 33 on left-hand side; 39 on right-hand side; and 1 air button. Buttons are chrome domed. Round-end steel reeds. Eight-fold black leather bellows. Left-hand strap is original with Lachenal gilt, right-hand strap has been added later. Straps are fixed on wooden hand bars with nickel screws and bone clamps. Very ornate chromed nickel fretwork, inset to ends. Serial number 4020. Engraved on the scroll label: The Edeophone Duet, Lachenal & Co, London WC."
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                {
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                    "value": "21-Apr-99",
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            "type": "description",
            "value": "free reed"
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                    "primary": true
                }
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            "value": "McCann duet system. Serial number 4020. Engraved scroll label: 'The Edeophone Duet, Lachenal & Co, London WC.'\n10\" twelve sided very ornate chromed nickel fretwork, inset to edges.\n72 + 1 keys: 33 left-hand, 39 right-hand, + 1 air. Chrome domed.\nLeft-hand strap original gilt Lachenal, right-hand strap later, on wood hand bars, nickel screws and bone clamps.\nEight-fold black leather bellows.\nRound-end steel reeds."
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            "value": "The 12-sided 'Edeophone' concertina was first manufactured by the Lachenal company around 1890. Distinguished by its division of bass and treble notes between the left and right hands, the 'Duet' System allows one to play a melody and accompaniment at the same time \u2013 a duet. Charles Wheatstone's patent of 1844 shows evidence of his work on this model, but it was not until the system was further developed and patented in 1884 by John Hill Maccann of Plymouth, that it became successful. The Maccann 'Duet' system was first licensed for production to Lachenal and it was later adopted by the Wheatstone company.  'Duet' concertinas were favoured by London music-hall artists of the early 20th century, such as Percy Honri (1874-1953)."
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                        "value": "2007-09-17",
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            },
            "type": "X20L description",
            "value": "Lachenal 'Duet' system concertina. This style of concertina is one of a family of hand-held bellows-blown free reed instruments. Distinguished by its division of bass and treble notes between the left and right hands, the 'Duet' System allows one to play a melody and accompaniment at the same time - a duet. Originally patented by Charles Wheatstone in London in 1844, it was not until the system was further developed and patented in 1884 by John Hill MacCann of Plymouth, that it became successful. The MacCann 'Duet' system was later adopted by the firms of both Wheatstone & Co. and Lachenal and Co. 'Duet' concertinas, were favoured by London Music-Hall artists of the early 20th century, such as Percy Honri (1874-1953)."
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            "term": "wood",
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            },
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                "method": {
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            {
                "summary": {
                    "title": "Lachenal, Louis"
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